physical disk access
Fri Dec 31 13:28:00 GMT 1999
Bob McGowan wrote:
> I wanted to use dd to verify disk sizes on reads and writes, so I used
> the following two commands:
> dd if='\\.\F:' of=/dev/null bs=1024k
> zero | dd of='\\.\F:' bs=1024k
> where the command zero just generates null bytes on standard out.
> I would have expected dd to work for both in and out operations under
> these circumstances. Any idea why it didn't?
> I am running the Cygwin 1.0 environment from the CD, no updates.
If you want to use raw devices with cygwin you have to mount them.
mount -f -b -s //./F: /dev/hdb2 # partition
mount -f -b -s //./physicaldrive0 /dev/hda # hard disk
mount -f -b -s //./tape0 /dev/st0 # rewind tape
mount -f -b -s //./tape0 /dev/nst0 # same as norewind
In further commands you have to use the mountpoints for correct
dd if=/dev/hdb2 of=/dev/null bs=1024k
zero | dd of=/dev/hdb2 bs=1024k
Hope, this helps,
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