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So I have a computer with two 2TB hard drives in Windows XP formatted as NTFS, one of them is working fine so I get around 80 MB/s transfer which is normal. But on the other hard drive I only get 4 MB/s. Neither are the primary hard drive.

However if I boot into the Ultimate Boot CD for Windows they booth perform around 80 MB/s.

The fast hard drive is formatted as two large NTFS partitions while the slow drive is mostly one large NTFS partition with three other small partitions that don't get assigned drive letters.

Does anyone know what could cause this issue? I've tried disabling McAfee virus scanner and ZoneAlarm but that didn't help anything.

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perhaps the file system size is too big for XP (assume 32bit) I've seen NTFS performance go down on large sizes (though I had not that big filesystems, yet)

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  • Yeah that's one of my guesses, but it seems weird because it works fine on the Windows XP on the Ultimate Boot CD, which I believe is also 32 bit. However, it is something to try.
    – Jason Axelson
    Nov 20, 2009 at 17:54
  • Can this be changed without reformatting the drive?
    – kevininspace
    Jun 26, 2010 at 16:00

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