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Date: Thu, 27 Oct 2011 12:35:09 -0700
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Subject: Re: [gentoo-user] the same hard-drives, different number of sectors...
From: Mark Knecht <markknecht@gmail.com>
To: gentoo-user@lists.gentoo.org
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On Thu, Oct 27, 2011 at 11:41 AM, Jarry <mr.jarry@gmail.com> wrote:
> Hi, perhaps someone could explain this to me:
>
> I have bouth two the same hard-drives. The same model
> (Hitachi HUA722050CLA330), the same firmware (JP20A3EA),
> the same size (500GB). Well, not exactly. Both hdparm
> and fdisk report different number of sectors (976771055
> versus 976773168). Although not a big difference, yet
> I expected them to be exactly the same (want to use
> them for raid1).
>
> So how is it possible they do not have the same number
> of sectors? I have bought them from one supplier, even
> their serial numbers are very close (only the last 2
> characters out of 24 are different)...
>
> Jarry
Maybe one has some stuff mapped out due to bad blocks found during
manufacturing or something like that? Not sure what it will tell you
but have you run smartctl on the drives and looked around at what they
tell you to find any differences?
- Mark