dd if=/cygdrive/a of=foo.img doesn't work

[ulists@iname.com]

I would like to make a low copy of a
1.44 disk and I have only a NTworkstation
on my hand. so I installed gnu tools from
cygwin and I taped
dd if=/cygdrive/a of=foo.img
but I got this:
dd: /cygdrive/a: Invalid argument

then I tried
cat /cygdrive/a >foo.img

with the same err:
cat: /cygdrive/a: Invalid argument

Why it doesn't work ? What can I do for a low copy ?


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