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Author Topic: Archival properties of unused Hard Drives  (Read 35900 times)
DeeJay
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« on: January 19, 2011, 06:11:43 PM »
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Hi All,

Just wondering if anyone knows how long an unused hard drive will last for? Googling the matter returns mixed results and certainly nothing definitive or seemingly reliable.

I'm wondering about my backups, and 2nd backups. I wonder how reliable it all is.

Thanks,
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Chris Sanderson
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« Reply #1 on: January 19, 2011, 09:12:49 PM »
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Bad News: basically in a year or so the magnetic information on an unused HD will start to evaporate. The drives should be 'refreshed' regularly to prevent data loss.

Good news: read more on this here

If you are on a Mac there is a simple Apple Script written that really helps execute the drive refresh. Read about that and download the script, here. Scroll down to the entry entitled: Refreshing Hard Drives Revisited
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Christopher Sanderson
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Gemmtech
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« Reply #2 on: January 19, 2011, 10:11:29 PM »
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"Bad News: basically in a year or so the magnetic information on an unused HD will start to evaporate. The drives should be 'refreshed' regularly to prevent data loss."

I really don't know what the answer is, but I do know this, recently I decided to buy a Vantec

http://www.vantecusa.com/en/product/view_detail/266

Mainly because I had a hard drive from an IMac I hadn't backed up go south on me.  Apple wanted to send it to one of their authorized data recovery centers, I called and they wanted $2500-$4000 to recover the date, so I put the hard drive in a box and put it in storage for about 1.5-2 years.  I bought one of the $20.00 Vantec units, hooked up my hard drive, plugged it into my PC and recovered all my data.  I then decided to take a bunch (10+) of hard drives I had from about 10 years ago and I was able to recover all the data from all the drives.   So if the data starts to evaporate from a hard drive within a year, consider me the luckiest bastard on earth.   
« Last Edit: January 19, 2011, 10:14:55 PM by Gemmtech » Logged
DeeJay
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« Reply #3 on: January 20, 2011, 04:26:35 AM »
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Thanks for the links, an interesting read that seems reliable, and I have to say a little shocking! I have hard drives that I hadn't touched for 5 years that were perfectly fine. I've been using a FW800 Sata Dock for hard drives which is really convenient for backups. Guess I need to diarize a couple days a year to refresh these backups.

Thanks for the info.
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Schewe
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« Reply #4 on: January 20, 2011, 03:34:17 PM »
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Bad News: basically in a year or so the magnetic information on an unused HD will start to evaporate. The drives should be 'refreshed' regularly to prevent data loss.

Chris, I think the official term is "bit rot"...

:~)

Also, the hardest thing on electronics is the first rush of current through the system when it's turned on. That's when some bad things can happen to drives and components fail. The next most likely problem is directory corruption-which can be easier to recover data from.  In general if you are buying the high quality (non-OEM) with a minimum 3 year and ideally 5 year warrantee, the MTBF is a much larger number and thus more reliable. You do tend to get what you pay for.
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John.Murray
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« Reply #5 on: January 20, 2011, 05:49:37 PM »
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The technique used in the scripts Chris refers to essentially copies all the data on a drive to a nul device.  Reading data on a hard drive refreshes it.  Interestingly Windows does not give you a nul block device you can copy to!  MS has this "workaround", which for our needs is complety useless:

http://support.microsoft.com/kb/319137

My practice is to simply copy archive drive to new drive every 2nd year, and yes, i reuse drives for this purpose
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kikashi
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« Reply #6 on: January 21, 2011, 02:52:00 AM »
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Reading data on a hard drive refreshes it.
Seems counter-intuitive to me. Why and how does reading refresh?

Jeremy
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John R Smith
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« Reply #7 on: January 21, 2011, 04:11:48 AM »
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So -

If you had a USB external HD which had been in a cupboard for a year or so, if you simply plugged it in to a live PC and left it attached for a day, would the OS automatically check the drive and refresh any bad sectors etc?

John
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kers
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« Reply #8 on: January 21, 2011, 07:14:33 AM »
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The technique used in the scripts Chris refers to essentially copies all the data on a drive to a nul device...


Does this script the same as doing a complete surface scan..? Reading the complete harddisk block to block  as is possible with Tech Tool Pro ?
« Last Edit: January 21, 2011, 07:17:14 AM by kers » Logged

Pieter Kers
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Chris Sanderson
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« Reply #9 on: January 21, 2011, 10:13:09 AM »
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Does this script the same as doing a complete surface scan..? Reading the complete harddisk block to block  as is possible with Tech Tool Pro ?
Yes
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Christopher Sanderson
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Oh this shows up in here!


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« Reply #10 on: January 21, 2011, 12:30:01 PM »
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Seems counter-intuitive to me. Why and how does reading refresh?

Not counter-intuitive at all - HDDs rely on magnetism to read/write data, and reading it refreshes it.

Whether that happens and has a meaningful impact on drive longevity is another matter Wink

To contribute to the black magic and speculation, I've read on the internets that the main contributor to HDD failure for idle (unplugged) drives is that the lubricants don't work as well anymore.

And another black magic trick for dead drives: stick them in a freezer for an hour and it might wake up for long enough to be able to pull data off it. This is counter-intuitive given the above point, but I've read enough anecdotes of successes to have tried it myself - to no success.
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Schewe
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« Reply #11 on: January 21, 2011, 12:39:21 PM »
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And another black magic trick for dead drives: stick them in a freezer for an hour and it might wake up for long enough to be able to pull data off it. This is counter-intuitive given the above point, but I've read enough anecdotes of successes to have tried it myself - to no success.

Not sure about the freezer cause that's pretty cold for the operating ranges of HDs, but I did recover data off a laptop whose drive was overheating and then shutting down by putting the laptop in the refrigerator which slowed down the overheating enough that I could get the data off the drive. As I remember, I could get about 15-20 minutes of copy time until it heated up enough to lock up the laptop. Then I had to let it sit shut down for a few hours to cool. I recall it took the better part of a day to get everything off the drive. That's useful for a situation where the drive itself is overheating...won't help other drive issues though.
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John.Murray
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« Reply #12 on: January 21, 2011, 12:42:07 PM »
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Seems counter-intuitive to me. Why and how does reading refresh?

Jeremy

Modern drive heads are down to reading quantum levels, at this level you can't observe something without affecting it; you have to read and refesh what is there

https://www1.hitachigst.com/hdd/technolo/gmr/gmr.htm
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John.Murray
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« Reply #13 on: January 21, 2011, 01:10:08 PM »
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I've actually did the freezer trick long ago on an ancient scsi drive - the explanation the seagate tech gave me was the aluminum platter shrinking in size enough to allow acceptable head/track alignment.

More recently i recovered some files from a notebook drive, but in the case i suspect a component trace on the controller opening up as the drive achieved operating temperature.....
« Last Edit: January 21, 2011, 01:16:22 PM by John.Murray » Logged

Gemmtech
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« Reply #14 on: January 21, 2011, 01:54:04 PM »
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I want to know why all you people aren't backing up your HDs?  You should never have to put it in the freezer or plug it into an external source in order to get the data have, I thought this only happened to me!  Grin 
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Schewe
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« Reply #15 on: January 21, 2011, 06:41:45 PM »
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I want to know why all you people aren't backing up your HDs? 

Oh, I have backups of backups for mission critical workstations...it seems like it's the less than mission critical drives like on a laptop or a 2nd workstation sometimes falls through the cracks...my most recent problem was that on my 2nd machine (which houses email and iTunes music) hadn't been backed up for a month. So, of course, THAT'S the drive that got a corrupted directory that couldn't mount of boot. I got everything back through a software tool and the fridge wouldn't have mattered since the drive was ok but the directory was corrupted. I mean, it wouldn't have been a total disaster...except for losing a month of email and about 100 iTunes tunes...

Lots of drives, lots of machines...sometimes things fall into the cracks. Those will be the drives that blow upthanks to Murphy's law.
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Gemmtech
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« Reply #16 on: January 21, 2011, 09:20:45 PM »
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Jeff you are a bad man!   Wink   I always back up now, I at one time got lazy, but now it's a daily ritual.   Aren't negatives GREAT?  I mean we don't have to back them up, they are always there.  Sometimes I wonder if digital imaging is easier or more complicated or both?
« Last Edit: January 21, 2011, 09:22:33 PM by Gemmtech » Logged
Schewe
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« Reply #17 on: January 21, 2011, 09:27:31 PM »
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Aren't negatives GREAT?  I mean we don't have to back them up, they are always there.

What, you've never had a basement flood?

I've prolly spent more time recovering negs at risk then trying to recover digital objects...but it may be close to a toss up. Kinda like 6 of one, 1/2 dozen of the other really...
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Gemmtech
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« Reply #18 on: January 22, 2011, 03:06:01 AM »
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"What, you've never had a basement flood?" 

A couple times, however the negatives were high enough off the ground in a nice cabinet.  I even have my father's negatives from the 30s-80s.  I guess there's a part of me that misses that, I still have every negative / slide from every photo I have ever taken and not one has ever become corrupted or gone bad.  I don't need 2-3 backups, though I have scanned most of them into my computer.  Label the negatives, put them away and one could forget about them, today we have to remember to back up and make a back up of the back up and then we can't forget about the files because media goes bad, so we need to keep moving the files from drive to drive............................and so on and so forth.
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Farmer
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« Reply #19 on: January 22, 2011, 04:10:39 AM »
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That's true, but if the worst happens to the place where the negatives are stored - they're gone.  If you have offsite backups of your digitals, they're all good.  They also take up less space :-)
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