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 Post subject: Hard drive lose capacity over time
PostPosted: Thu Mar 22, 2012 11:10 pm 
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Do hard drives lose capacity over time?

I recently reconfigured and reformatted a pair of samsung F3 1TB (which has always been in windows 7 software raid). However, when I tried to recreate the raid, I realized that one hard drive reports 931.39 capacity while the other reports 931.51.

Looking at S.M.A.R.T., the value for reallocated sector count is still at 200 and didn't drop a bit for either hard drive. Am I missing something? Why is this happening?


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 Post subject: Re: Hard drive lose capacity over time
PostPosted: Fri Mar 23, 2012 1:13 am 
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Blood wrote:
Do hard drives lose capacity over time?

I recently reconfigured and reformatted a pair of samsung F3 1TB (which has always been in windows 7 software raid). However, when I tried to recreate the raid, I realized that one hard drive reports 931.39 capacity while the other reports 931.51.

Looking at S.M.A.R.T., the value for reallocated sector count is still at 200 and didn't drop a bit for either hard drive. Am I missing something? Why is this happening?

Perhaps one has a 100MB boot partition, which got rounded to the .12 GB difference you're seeing?


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 Post subject: Re: Hard drive lose capacity over time
PostPosted: Fri Mar 23, 2012 1:54 am 
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Another possibility is that one of the drives is partitioned as a GPT drive and the other as an MBR drive. GPT puts a ~128MB metadata area at the beginning of the drive IIRC...


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 Post subject: Re: Hard drive lose capacity over time
PostPosted: Fri Mar 23, 2012 2:28 am 
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Blood wrote:
Looking at S.M.A.R.T., the value for reallocated sector count is still at 200 and didn't drop a bit for either hard drive.

That's unlikely. You're probably looking at the wrong value.

In any case, there's no relationship between that and your partition's capacity (see the other comments).


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 Post subject: Re: Hard drive lose capacity over time
PostPosted: Fri Mar 23, 2012 6:19 am 
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Joined: Thu Nov 19, 2009 10:20 am
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Location: Ottawa
Assuming you don't need anything currently on the drives:

- Run "diskpart" from an administrator command prompt
- Type "list disk" to get a list of all your drives
- Type "select disk N" where N is one of your F3 drives. Be VERY careful that you are selecting the correct drive
- Type "clean". This will erase all and any partitioning on the drive.
- Repeat the select disk and clean for the other F3.

Exit, reboot and then check the drive sizes.


One other possibility: Are the drives the EXACT same model? Not just F3, but the whole model #. Different batches of the "same" drive can be slightly different in size. See if there is an LBA sector count on the label and if they are the same.


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 Post subject: Re: Hard drive lose capacity over time
PostPosted: Fri Mar 23, 2012 8:04 pm 
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m1st wrote:
Another possibility is that one of the drives is partitioned as a GPT drive and the other as an MBR drive. GPT puts a ~128MB metadata area at the beginning of the drive IIRC...


Thanks, that was it.


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