Re: [gentoo-user] Hard Disk going a lot slower now...

[Chris Walters <cjw2004d@comcast.net>]

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Richard Fish wrote:
> On 11/26/06, Chris Walters <cjw2004d@comcast.net> wrote:
>> Well, in Gentoo, the results of "hdparm -t /dev/sda" were around 65 MB /
>> second.  dmesg shows the drive in UDMA/133 mode, and I didn't bother
>> with lspci.  In Windows, however, the benchmarks are quite different -
>> around 4300-4600 KB / second.  At least I know the problem is not with
>> the drive.
> 
> Well one thing to keep in mind here is that disk throughput is not
> constant everywhere.  That 65MB/s is on low-numbered cylinders,
> typically near the outside edge of the drive, where the linear
> velocity is highest.  That same drive may only give 20-30MB/s on the
> inside cylinders.
> 
> What are you using to benchmark the drive under windows?  Is it
> measuring raw disk throughput, or through the NTFS filesystem?
> 
> -Richard

Hello Richard,

I would assume that the two benchmark programs I am using to measure the
drive performance under windows go through windows, and thus the NTFS
interface.  They are Dr. Hardware and FreshDiagnose.  The second one
showed a write speed as quoted above, and a read speed of about 280 MB
per second...  Though the same one reported a read speed of about 900+
MB per second for my USB drive (not really possible, since the maximum
speed for USB 2.0 is about 480 MB / second).

This is very frustrating.  At first the drive was quite fast, under
windows and now it is extremely slow...  I asked about this in a windows
xp pro group, and so far no one is touching it.

Regards,
Chris
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