On Friday 09 July 2010 08:54:15 patrick keshishian wrote:
quoted text
> Hi,
> 
> I recently attempted an installation from a usb memory stick, where
> installation of xfont47.tgz failed consistently due to "crc error"[0].
> The stick was prepared following steps from OBSD FAQ[1].
> 
> I recopied xfont47.tgz file to the stick, and confirmed (or so I
> thought) that the source and new copy of this file were identical
> using cmp(1).
> 
> Restarting the install bombed on the same file. So I stuck the stick
> in my source computer and mounted it and ran md5(1) on it. Sure enough
> the checksum is different from the source. I did a umount(8) and a
> mount(8), then ran md5(1) again, and this time yet a new value was
> reported. While mounted, running md5(1) again reports the same value
> -- i assume this is because the file is cached at this point --
> explaining why cmp(1) initially failed to raise a flag. Every
> umount(8), mount(8) and md5(1) gives a new result:
> 

In adition to previous answers:
http://www.undeadly.org/cgi?action=article&sid=20100404103735

gr
Renzo