USB issues.

I have an old Dell machine running SUSE 10 which basically does backups
of two XP machines (well copies actually).

The copies are done to an external USB disk called DISK1. For
safety/paranoia after it is done DISK1 is then copied to DISK2. DISK1
is served by Samba and is read/write enabled. DISK2 is also served by
Samba but is set to be read-only. THe USB card is a 4 port Belkin card
and the two external caddies are Safecom ones.

Originally this config had a 120GB Seagate disk in each caddy and it
was pretty quick especially the DISK1 to DISK2 copy which typicallty
did about 1GB every 2 minutes.

Both the 120GB disks broke over the last couple of months and now it's
a Maxtor 160GB disk (2mb) cache and a Hitachi Deskstar 160GB (8mb
cache). When the second disk was repopulated on the first run the DISK1
to DISK2 copy took nearly 26 hours which is down to 2GB per hour.

No apparent problems in dmesg but when I did an fsck of the Hitachi
disk I got this

"(/dev/sdb1) has been mounted 320 times without being checked, check
forced"

Now I know I didn't mount the disk 320 times so why did it? When I
access either disk via Samba they're both pretty quick and don't
generate errors. Is it the difference in size of the cache's?

.

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