Bunged it in a G5 iMac. Very quiet, runs cooler than the average drive, and it's performance is way way better than the 200GB Seagate drive it replaced. Excellent and highly recommended. The 2TB looks even better.
some of WD's other marketing material makes it clearer (last two words below), but i would have hoped for the tiniest bit of fact checking from a hardware review! peddling this kind of BS only serves to perpetuate the myth that WD have done something remarkable
Caviar®GP
IntelliPower™ — A fine-tuned balance of spin speed, transfer rate, and caching algorithms designed to deliver both significant power savings and solid performance. For each GreenPower™ drive model, WD may use a different, INVARIABLE RPM.
You're quite right Mr Anonymous that the capacity is not reduced by formating and that this is the difference between true capacity and the wretched 'decimal' Gigabytes that appear on the specification..
The point is that you only see the true capacity once the drive is installed and formatted so it appears that formatting eats capacity.
In this context 'formatted capacity' is short hand for 'you actually get'
I would get more but I'm happy with the 3TB I've already got (RAIDed of course). Problem I find with these big drives is the cost in that you have to buy at least 2 just in case one dies and you loose all that data.
Unless the article has been modified since your reading, it states:
complete with IntelliPower motor control which means that some drives in the product range may have a rotational speed of 5400pm while others may operate at up to 7200rpm
Which clearly (to me) indicates the speed is set at the factory per unit, and does not vary at all. So your comment:
these drives do NOT vary the spin speed dynamically.
Seems to agree with how I understand the article in the first place.
What is it with computer peoples' fascination with thinking that TiB are the "true" units? Historically, the ONLY computer-related units which have been in the power-of-two magnitudes have been memory and hard drive space. Everything else (CPU speed, network bandwidth, display resolution, etc.) have always been in the proper scientific power-of-ten magnitudes. There are very solid technological reasons for memory to be based on power-of-two magnitudes, but there aren't for disk space, and fundamentally it's not like it really matters to the end-user to begin with. And yet, operating systems still report hard drive space in powers of two instead of powers of ten, which then leads to the ridiculous "formatted capacity less" weasel words which only serve to add to the confusion.
We should stop taking hard drive manufacturers to task, when the blame lies SOLELY in the hands of the OS vendors.
pictures on page one are a2 platter 4 head drive. Only picture on the last page shows a 4 platter drive , and then i even doubt that its the 2Tb drive.
It is always dissappointing to encounter data graphed in a misleading way. In this case, the obfuscation was acheived by using a non-zero crossing point for the x-axis on several comparison graphs.
A prime example of this is your comparison of Burst Speed - at first glance the Intel X25-M appears to be many multiples faster than its rotating disc rivals... but the truth is the difference is less than 20% between fastest and slowest!
Attempting to emphasize a point is one thing, but the poor choice of graphing technique only succeeds to make the review seem amateurish - more suited to a mass-market newspaper article than a report from a "respectable" tech focused website.
I had a friend who actually worked for WD. He (hi Dave) commented that often there are resonances in the drive and they vary the speed a bit to "tune these out". I suspect that on the factory line they tune the speed of the drive to have the minimum amount of resonance while the drive is running. This can lead to quieter drives since they won't shake rattle and roll. I suspect that this is the "dynamic" they are talking about. This variation in speed is just ONE of the many "tricks" they do in making large capacity drives.
Now if they made it in wide SCSI it would be even better!!
No, its not. The letter H is not silent, nor yet is it a vowel.
As for the 'formatted capacity' debate, actually the volume does decrease, with all practical file-systems, as a certain amount of space is always reserved for bad sectors, and some need overhead space for allocation tables. The effect is not as pronounced as the 1024/1000 thing for a drive this big, but it does exist.
Actually you're all wrong ;) The reason we use 'an' before certain words and 'a' before others is purely an oral one - it's difficult to pronounce the word 'a' followed by a word which begins with a vowel sound. If, for example, there was a word which began with a silent vowel followed by a consonant, (not that I can think of any) you wouldn't precede it with 'an'.
Whether to use 'an' or 'a' in front of words beginning with an H is purely down to whether you pronounce the H or not. Both can be argued as an acceptable use of standard English. This peculiarity is largely down to the fact that the letter H, while not a vowel, begins with a vowel sound: 'aitch'.
Agreed AC at first glance the charts are misleading, they need to be referenced to zero, otherwise it shows the highest stat proportionally a lot 'better' if thats the right word, than the remainder.
I do wish hard drive manufacturers would stop lying about the size of their drives.
We all know that all major OSes (Windows, Mac OS X, Linux (listed in no particular order)) read sizes correctly, thus:
1K = 1024 bytes.
1M = 1024K
1G = 1024M
1T = 1024G
Thus a drive of 2,000,000,000,000 is not 2TB as Western Digital would claim, but is in fact 1.81TB as the article correctly stated. Though I do like the wording "2TB, 1.81TB when formatted" - as if formatting it magically changes the definition of a terabyte.
We have laws in this country about fraud, deception, mis-selling a product, etc. How come drive manufacturers are still allowed to blatently lie about how much space you're getting, just because the average computer user doesn't know that capacities are measured in binary quantities not decimal ?
I hope one day this gets corrected and the drive manufacturers get the slap in the face they deserve. As capacities get bigger and bigger, the discrepancy between what they say you're getting and what you're really getting gets more and more. In this case, you're being cheated out of a whopping 0.19TB (194.56 GB, or 199,229 MB). Thats an entire hard drive's worth, even by todays standards.
Imagine if memory modules were sold using this system?
"The module is 2147 MB in size (2GB when installed in system)". I doubt it would wash.
If you hunt around you can get 2 x 1TB drives cheaper. I understand the law of 'new' products and supply and demand etc. But surely it costs them less to manufacture one drive than two despite the higher capacity platters?
Using the Queen's English, you'd pronounce the 'h' in 'horrendous' if speaking correctly, thus the printed version should assume an audible 'h' and therefore 'a' before it.
This extends out to the 'a historical' day, however it is the most contentious. However searching Google (an odd acid test admittedly) shows "a historical" has ~10m hits compared to ~4m for "an historical".
What really gets me is when people say "an historical" but also pronounce the 'h'.
And don't get me started on whether and weather... But then I'm a Scot and so pronounce it the BBC way
Just got a firewire drobo and shoved a load of spare old 500GB drives in there to act as a temporary backup for only my most important folders.
However, I've also wanted to be able to keep backups of all my dvds and animation work as well... some of the render outputs (particularly the folders containing 2500+ 1920x1080 TIFF files) are currently too big to be able to backup now that I've had to start making HD content.
Glad to hear it's quiet, too.. would rather not have 4 little rasping dinosaurs spinning away behind my desk when the backups are taking place.
1TB drives were not quite enough to offer a complete solution to all my backups needs, so I didn't bother upgrading.. 2TB does the job nicely.
I can't see myself needing a 4TB drive for a long time... unless something crazy like a new "superHD" standard comes along.
There seems to be the usual foolish confusion between RAID and backup here.
RAID mirroring (or to a lesser extent RAID5) gives you protection against a hardware failure making data unavailable.
In a full time RAID setup, what protection is there against data being unintentionally corrupted or deleted by the user, by an app, or by the OS? None.
If I had one of these, I'd want two of them, not in any kind of RAID config. And every now and then, I'd use some kind of file sync program to sync the copies of the data. In that way, there is some kind of window when an unintentionally damaged file can be restored from the backup. OK the intact copy may get overwritten if the damage isn't noticed before the next sync point, but only if the sync program doesn't ask for confirmation before overwriting the old copy...
You're right that RAID is not the same as a backup, it just provides protection against data loss due to built-in redundancy.
In some advanced file system like Sun's ZFS or NetApp's offerings, there *is* protection against data being unintentionally corrupted or deleted by the user, application or OS: they are called snapshots. Files and directories referenced by snapshots cannot be deleted until the referring snapshot is deleted -- so there is your protection against loss. Also files/dirs referenced by snapshots cannot be modified -- these file systems employ a method called 'copy-on-write' which means that if a file referenced by a snapshot is modified, the file system creates a copy. If I remember correctly, the common blocks of the two files are not duplicated, to save space, but don't quote me on that :)
A traditional 2-drive mirror is fine until you need, in this case, 2.1 TB. Also traditional mirrors often don't repair files that can't be read -- the file system/RAID controller often just returns the data on the good half of the mirror. However, ZFS also repairs the faulty file on the bad side of the mirror, as indeed it does in any redundant setup: mirror, RAID-Z1 (like RAID 5), or RAID-Z2 (like RAID 6).
For backup/syncing of files that you mention, again, ZFS offers a way of doing this -- with one important difference and huge benefit: you will never lose any data that gets deleted if you use (1) automatic snapshotting (via cron every 30 minutes or whatever), and (2) use 'zfs send/receive' to send an initial full backup and subsequent incremental backups, in which ZFS detects diffs between snapshots and sends only the differences, to another storage pool, which might be on the same machine or a different machine on the LAN/WAN.
WD My Passport Essential 500GB Portable Hard Drive - Black (USB 2.0)
WD Caviar Black 1TB Hard Drive (Serial ATA-300, 7,200 RPM, 32MB)
WD My Book Essential Edition External 1TB Hard Drive (USB 2.0, 16MB)
Intel X25-M Gen2 160GB 2.5" Solid State Drive (SATA)
WD My Passport Essential Portable 320GB Hard Drive - Black (USB 2.0)
Western Digital Caviar Green 2TB hard drive
Mr ChriZ
One word #
Posted Tuesday 27th January 2009 13:45 GMT
Awesome :-D
Anonymous Coward
Finally! #
Posted Tuesday 27th January 2009 13:45 GMT
Hurrah!
Anyone know the release date of this? Need a couple for my media box - my 1TB drives are nearing capacity....
Anonymous Coward
2TB Capacity #
Posted Tuesday 27th January 2009 13:45 GMT
"2TB - 1.81TB once formatted"
Formatting has nothing to do with it. Using proper units will show why.
2TB = 2*1000*1000*1000*1000 = 2,000,000,000,000 bytes
1.81TiB = 1.81*1024*1024*1024*1024 = 1,990,116,046,274 bytes
Formatting a hard disk doesn't suddenly reduce its capacity by 190GB...
Ian Halstead
Bought a 1TB one #
Posted Tuesday 27th January 2009 13:45 GMT
Bunged it in a G5 iMac. Very quiet, runs cooler than the average drive, and it's performance is way way better than the 200GB Seagate drive it replaced. Excellent and highly recommended. The 2TB looks even better.
Anonymously Deflowered
The ULTIMATE in storage #
Posted Tuesday 27th January 2009 14:12 GMT
I can't see a day when anybody will *ever* need more than 2TB of disk storage in a home computer. Hats off to Western Digital!
Chris McFaul
ANOTHER mistake #
Posted Tuesday 27th January 2009 15:06 GMT
For about the millionth time
these drives do NOT vary the spin speed dynamically.
WD even had to issue a clarification because so many people were incorrectly making this assumption.
people have hooked up microphones to CRO's to measure their hum to prove the drive speed never changed.
the make a hard drive motor which can change its speed in the way suggested would be VERY difficult.
Unless by vary you mean : 5,400rpm and 0 rpm (the only variation it can do)
This post has been deleted by a moderator
Chris McFaul
a better clarification: #
Posted Tuesday 27th January 2009 15:06 GMT
some of WD's other marketing material makes it clearer (last two words below), but i would have hoped for the tiniest bit of fact checking from a hardware review! peddling this kind of BS only serves to perpetuate the myth that WD have done something remarkable
Caviar®GP
IntelliPower™ — A fine-tuned balance of spin speed, transfer rate, and caching algorithms designed to deliver both significant power savings and solid performance. For each GreenPower™ drive model, WD may use a different, INVARIABLE RPM.
Anonymous John
"Online Price: from £97.35 — 1 sellers [Click for details]" #
Posted Tuesday 27th January 2009 15:06 GMT
That's for the 1TB one.
Anonymous Coward
Only 2 TB? #
Posted Tuesday 27th January 2009 15:06 GMT
I already have over 2 TB and im almost full, I'll take 4!
I have my entire dvd collection dumped on my hard drives as images as well as music, high def home movies and such.
Only downside to having such a big drive is risk of failure, so best use them in pairs in a raid.
Leo Waldock
Formatting and capacity #
Posted Tuesday 27th January 2009 15:06 GMT
You're quite right Mr Anonymous that the capacity is not reduced by formating and that this is the difference between true capacity and the wretched 'decimal' Gigabytes that appear on the specification..
The point is that you only see the true capacity once the drive is installed and formatted so it appears that formatting eats capacity.
In this context 'formatted capacity' is short hand for 'you actually get'
Richard Drinkwater
Available for pre-order now #
Posted Tuesday 27th January 2009 15:18 GMT
I've found a site where you can pre-order them for those who are interested:
http://www.overclockers.co.uk/showproduct.php?prodid=HD-263-WD
I would get more but I'm happy with the 3TB I've already got (RAIDed of course). Problem I find with these big drives is the cost in that you have to buy at least 2 just in case one dies and you loose all that data.
Mad Hacker
Not a Mistake @ Chris McFaul #
Posted Tuesday 27th January 2009 18:16 GMT
Unless the article has been modified since your reading, it states:
complete with IntelliPower motor control which means that some drives in the product range may have a rotational speed of 5400pm while others may operate at up to 7200rpm
Which clearly (to me) indicates the speed is set at the factory per unit, and does not vary at all. So your comment:
these drives do NOT vary the spin speed dynamically.
Seems to agree with how I understand the article in the first place.
We need a "defending the author" icon.
Ex-IT
Nice, but... #
Posted Tuesday 27th January 2009 18:16 GMT
Is there a model which comes with a complete case, trying to compete with the Raptor-X by having the platters open like that really isn't good idea.
Karel Jansens
Sooo.... #
Posted Tuesday 27th January 2009 18:17 GMT
When will it eat our data then?
Simon Breden
Don't lose it #
Posted Tuesday 27th January 2009 18:17 GMT
With this much (video) data, you most certainly don't want to risk losing it all !
Luckily, that's what ZFS is built to do -- protect it from loss:
http://breden.org.uk/2008/03/02/a-home-fileserver-using-zfs/
Anonymous Coward
Grrr... #
Posted Tuesday 27th January 2009 18:17 GMT
"reports came flooding in that Barracuda 7200.11 drives were dying at an horrendous rate"
It's *A* horrendous rate...
Tch....
fluffy
TB vs. TiB #
Posted Tuesday 27th January 2009 21:45 GMT
What is it with computer peoples' fascination with thinking that TiB are the "true" units? Historically, the ONLY computer-related units which have been in the power-of-two magnitudes have been memory and hard drive space. Everything else (CPU speed, network bandwidth, display resolution, etc.) have always been in the proper scientific power-of-ten magnitudes. There are very solid technological reasons for memory to be based on power-of-two magnitudes, but there aren't for disk space, and fundamentally it's not like it really matters to the end-user to begin with. And yet, operating systems still report hard drive space in powers of two instead of powers of ten, which then leads to the ridiculous "formatted capacity less" weasel words which only serve to add to the confusion.
We should stop taking hard drive manufacturers to task, when the blame lies SOLELY in the hands of the OS vendors.
Cucumber C Face
Too late #
Posted Tuesday 27th January 2009 21:45 GMT
Thanks to the new "extreme" pr0n laws storage needs are in freefall across the England and Wales.
Then again our Jacqui Smith's Uberdatabase could probably fill 200 of these a minute...
James O'Brien
In one word. . . #
Posted Tuesday 27th January 2009 21:45 GMT
WANT!!!!
Roland
Re: Grrrr.... #
Posted Wednesday 28th January 2009 00:38 GMT
An 'orrendous rate would work, too ;-)
vincent himpe
pictures are wrong... #
Posted Wednesday 28th January 2009 00:38 GMT
pictures on page one are a2 platter 4 head drive. Only picture on the last page shows a 4 platter drive , and then i even doubt that its the 2Tb drive.
Anonymous Coward
Poor presentation of graph data #
Posted Wednesday 28th January 2009 05:34 GMT
It is always dissappointing to encounter data graphed in a misleading way. In this case, the obfuscation was acheived by using a non-zero crossing point for the x-axis on several comparison graphs.
A prime example of this is your comparison of Burst Speed - at first glance the Intel X25-M appears to be many multiples faster than its rotating disc rivals... but the truth is the difference is less than 20% between fastest and slowest!
Attempting to emphasize a point is one thing, but the poor choice of graphing technique only succeeds to make the review seem amateurish - more suited to a mass-market newspaper article than a report from a "respectable" tech focused website.
Simon Guerrero
@anonymous coward #
Posted Wednesday 28th January 2009 10:15 GMT
It's not - it's "an horrendous". Just because most people don't write it properly, that doesn't mean it's not right.
Dear me.
Paris because she probably thinks it's "a horrendous" too.
Herby
Rotational speed #
Posted Wednesday 28th January 2009 11:03 GMT
I had a friend who actually worked for WD. He (hi Dave) commented that often there are resonances in the drive and they vary the speed a bit to "tune these out". I suspect that on the factory line they tune the speed of the drive to have the minimum amount of resonance while the drive is running. This can lead to quieter drives since they won't shake rattle and roll. I suspect that this is the "dynamic" they are talking about. This variation in speed is just ONE of the many "tricks" they do in making large capacity drives.
Now if they made it in wide SCSI it would be even better!!
Dave
@Simon Guerrero #
Posted Wednesday 28th January 2009 14:04 GMT
No, its not. The letter H is not silent, nor yet is it a vowel.
As for the 'formatted capacity' debate, actually the volume does decrease, with all practical file-systems, as a certain amount of space is always reserved for bad sectors, and some need overhead space for allocation tables. The effect is not as pronounced as the 1024/1000 thing for a drive this big, but it does exist.
/pedant
Charlie
Re:an v a #
Posted Thursday 29th January 2009 00:52 GMT
Actually you're all wrong ;) The reason we use 'an' before certain words and 'a' before others is purely an oral one - it's difficult to pronounce the word 'a' followed by a word which begins with a vowel sound. If, for example, there was a word which began with a silent vowel followed by a consonant, (not that I can think of any) you wouldn't precede it with 'an'.
Whether to use 'an' or 'a' in front of words beginning with an H is purely down to whether you pronounce the H or not. Both can be argued as an acceptable use of standard English. This peculiarity is largely down to the fact that the letter H, while not a vowel, begins with a vowel sound: 'aitch'.
N
Looks good #
Posted Thursday 29th January 2009 14:41 GMT
Space & lots of it!
Agreed AC at first glance the charts are misleading, they need to be referenced to zero, otherwise it shows the highest stat proportionally a lot 'better' if thats the right word, than the remainder.
Or is El Reg being paid by Intel?
Richard
Lying HD manufacturers #
Posted Thursday 29th January 2009 14:41 GMT
I do wish hard drive manufacturers would stop lying about the size of their drives.
We all know that all major OSes (Windows, Mac OS X, Linux (listed in no particular order)) read sizes correctly, thus:
1K = 1024 bytes.
1M = 1024K
1G = 1024M
1T = 1024G
Thus a drive of 2,000,000,000,000 is not 2TB as Western Digital would claim, but is in fact 1.81TB as the article correctly stated. Though I do like the wording "2TB, 1.81TB when formatted" - as if formatting it magically changes the definition of a terabyte.
We have laws in this country about fraud, deception, mis-selling a product, etc. How come drive manufacturers are still allowed to blatently lie about how much space you're getting, just because the average computer user doesn't know that capacities are measured in binary quantities not decimal ?
I hope one day this gets corrected and the drive manufacturers get the slap in the face they deserve. As capacities get bigger and bigger, the discrepancy between what they say you're getting and what you're really getting gets more and more. In this case, you're being cheated out of a whopping 0.19TB (194.56 GB, or 199,229 MB). Thats an entire hard drive's worth, even by todays standards.
Imagine if memory modules were sold using this system?
"The module is 2147 MB in size (2GB when installed in system)". I doubt it would wash.
-- Richard
Dick Emery
Too expensive? #
Posted Thursday 29th January 2009 16:39 GMT
If you hunt around you can get 2 x 1TB drives cheaper. I understand the law of 'new' products and supply and demand etc. But surely it costs them less to manufacture one drive than two despite the higher capacity platters?
Anonymous Coward
@Charlie #
Posted Thursday 29th January 2009 18:49 GMT
Using the Queen's English, you'd pronounce the 'h' in 'horrendous' if speaking correctly, thus the printed version should assume an audible 'h' and therefore 'a' before it.
This extends out to the 'a historical' day, however it is the most contentious. However searching Google (an odd acid test admittedly) shows "a historical" has ~10m hits compared to ~4m for "an historical".
What really gets me is when people say "an historical" but also pronounce the 'h'.
And don't get me started on whether and weather... But then I'm a Scot and so pronounce it the BBC way
Doug Southworth
@ Dick Emery #
Posted Thursday 29th January 2009 18:49 GMT
Yes, one can find 2x1TB drives cheaper, but then I would nee a RAID card that could handle 7 drives in order to build my 6TB RAID 5 array...
Another Anonymous Coward
Pricing is good, I'm getting 4. #
Posted Sunday 1st February 2009 00:19 GMT
Just got a firewire drobo and shoved a load of spare old 500GB drives in there to act as a temporary backup for only my most important folders.
However, I've also wanted to be able to keep backups of all my dvds and animation work as well... some of the render outputs (particularly the folders containing 2500+ 1920x1080 TIFF files) are currently too big to be able to backup now that I've had to start making HD content.
Glad to hear it's quiet, too.. would rather not have 4 little rasping dinosaurs spinning away behind my desk when the backups are taking place.
1TB drives were not quite enough to offer a complete solution to all my backups needs, so I didn't bother upgrading.. 2TB does the job nicely.
I can't see myself needing a 4TB drive for a long time... unless something crazy like a new "superHD" standard comes along.
Anonymous Coward
How do folk back these up? #
Posted Sunday 1st February 2009 20:33 GMT
There seems to be the usual foolish confusion between RAID and backup here.
RAID mirroring (or to a lesser extent RAID5) gives you protection against a hardware failure making data unavailable.
In a full time RAID setup, what protection is there against data being unintentionally corrupted or deleted by the user, by an app, or by the OS? None.
If I had one of these, I'd want two of them, not in any kind of RAID config. And every now and then, I'd use some kind of file sync program to sync the copies of the data. In that way, there is some kind of window when an unintentionally damaged file can be restored from the backup. OK the intact copy may get overwritten if the damage isn't noticed before the next sync point, but only if the sync program doesn't ask for confirmation before overwriting the old copy...
Chris McFaul
@ mad hacker #
Posted Monday 2nd February 2009 05:47 GMT
yes, quite obviously, that entire paragraph was completely re-written following my rant
it originally talked about dynamically varying the drive speed
Chris McFaul
a or an #
Posted Monday 2nd February 2009 05:47 GMT
he is right that its entirely down to the sound rather than the specific letter,
the easiest example is:
an MP
even though M is not a vowel, in this context it is pronounced:
em-pee
so its "an em-pee" :P
Simon Breden
Re: How do folk back these up? #
Posted Monday 2nd February 2009 22:50 GMT
You're right that RAID is not the same as a backup, it just provides protection against data loss due to built-in redundancy.
In some advanced file system like Sun's ZFS or NetApp's offerings, there *is* protection against data being unintentionally corrupted or deleted by the user, application or OS: they are called snapshots. Files and directories referenced by snapshots cannot be deleted until the referring snapshot is deleted -- so there is your protection against loss. Also files/dirs referenced by snapshots cannot be modified -- these file systems employ a method called 'copy-on-write' which means that if a file referenced by a snapshot is modified, the file system creates a copy. If I remember correctly, the common blocks of the two files are not duplicated, to save space, but don't quote me on that :)
A traditional 2-drive mirror is fine until you need, in this case, 2.1 TB. Also traditional mirrors often don't repair files that can't be read -- the file system/RAID controller often just returns the data on the good half of the mirror. However, ZFS also repairs the faulty file on the bad side of the mirror, as indeed it does in any redundant setup: mirror, RAID-Z1 (like RAID 5), or RAID-Z2 (like RAID 6).
For backup/syncing of files that you mention, again, ZFS offers a way of doing this -- with one important difference and huge benefit: you will never lose any data that gets deleted if you use (1) automatic snapshotting (via cron every 30 minutes or whatever), and (2) use 'zfs send/receive' to send an initial full backup and subsequent incremental backups, in which ZFS detects diffs between snapshots and sends only the differences, to another storage pool, which might be on the same machine or a different machine on the LAN/WAN.
These links might be of further interest:
http://breden.org.uk/2008/05/12/home-fileserver-zfs-snapshots/
http://breden.org.uk/2008/05/12/home-fileserver-backups-from-zfs-snapshots/
http://blogs.sun.com/erwann/date/20081013
http://opensolaris.org/os/community/zfs/docs/zfs_last.pdf
http://blogs.sun.com/timf/en_IE/entry/zfs_automatic_snapshots_0_11
http://channelsun.sun.com/video/opensolaris+demo+time+slider+in+opensolaris+2008.11/2972356001
I'll get me coat -- I'm off to the pub... :)