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  • From: sindi keesan <keesan AT sdf.lonestar.org>
  • To: baslinux AT lists.ibiblio.org
  • Subject: Re: [BL] Can BL copy Win98?
  • Date: Tue, 21 Nov 2006 15:54:54 +0000 (UTC)

On Tue, 21 Nov 2006 3aoo-cvfd AT dea.spamcon.org wrote:

sindi keesan wrote:

Several websites suggested specifying a larger block size than the
default to speed up copying:

dd if=/dev/had of=/dev/hdb bs=8k - copies in 8k blocks.

If you know the sizes of the HD buffers of the two
drives, set the bs to the size of the smaller buffer.


I just learned that drives used to have 256K-512K buffers in the late nineties (6-13GB) and a 40GB drive or a 250GB drive can have 4MB or 8MB.
850MB or 1.2GB WDC - 64K. Conner 540MB 64K.

Laptop Toshiba 4GB 0K buffer.

Above using a free Win31 program.

You can use linux instead:

hdparm -tT /dev/hda (1.2GB WDC)
Timing buffer-cache reads: 128MB in 1.17 seconds=109.40 MB/sec
Timing buffered disk reads: .... 6.03 MB/sec

hdb (10GB): 113.27 MB/sec 22.07 MB/sec

This gives relative disk speeds. Is there some free linux diagnostic program that gives more detailed access and transfer time info like DOS spinrite or syschk?

Info:
hdparm -i /dev/hda gives 8 lines of drive info
BuffSize=128kB (1.2GB WDC). hdb BuffSize=512kB (10GB Seagate)

I looked up online a 340MB Conner - 32k, a 540MB Conner - 64k
120MB Toshiba or Conner - 32k
bs=32k should be safe

keesan AT sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org




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