I'm trying to use "dd" to create a md5 checksum of a dvd. The problem is that
the number of records read by "dd" is always different depending on the OS
used. For example, using the same command below in both cygwin and linux
displays the following results.
dd if=/dev/scd0 bs=2048 iflag=direct | md5sum -b
Linux (ubuntu 8.10 amd64)
28446caccede349759e4e9fed8bce862
3025539+0 records in
3025539+0 records out
6196303872 bytes (6.2 GB) copied, 3347.83 s, 1.9 MB/s
Cygwin (windows xp pro)
15cab8963c4746eca21c014224adefa3
3025538+0 records in
3025538+0 records out
6196301824 bytes (6.2 GB) copied, 3323.91 s, 1.9 MB/s
For some reason there is always 1 less record read in cygwin. I've tested
numerous dvds and they all end up being 1 record less in Cygwin than the Linux
results. Why is this happening? Is there any way to force "dd" to skip 1
record at the very end of the dvd?
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