large hdd and no bios-update available

["gargarmel@gmx.net" <gargarmel@gmx.net>]

hi there,

i've been running a server on an old p133 with a large harddisc (120GB).
it was running after doing a maxblast-trick on the disc as i remember.

but now i moved into a new machine (ibm aptiva 2142).
after some problems this machine is now up and running.
i also performed the last available bios-update (1999) and it shows it
with something like 30gb (from bios-menu) instead of 8gb before.

obsd (3.4) tells:
bash-2.05b# df -h
Filesystem    Size   Used  Avail Capacity  Mounted on
/dev/wd0a     3.4G   331M   2.9G    10%    /
/dev/wd1i    97.4G  52.9G  39.7G    57%    /xchange

some folders in /xchange/ work fine (the smaller ones, probably placed
on beginning of disc).
but when i try to list another folder it tells:

bash-2.05b# ls mpz
Feb 21 22:49:36 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14), retrying
Feb 21 22:49:36 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14), retrying
Feb 21 22:49:39 mond last message repeated 4 times
Feb 21 22:49:40 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14)
Feb 21 22:49:39 mond last message repeated 4 times
Feb 21 22:49:40 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14)
Feb 21 22:49:40 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14), retrying
Feb 21 22:49:40 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14), retrying
ls: mpz: Input/output error
bash-2.05b# Feb 21 22:49:43 mond last message repeated 4 times
Feb 21 22:49:44 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14)
Feb 21 22:49:43 mond last message repeated 4 times
Feb 21 22:49:44 mond /bsd: wd1i:  id not found reading fsbn 58271360 of
58271360-58271375 (wd1 bn 81808160; cn 81158 tn 14 sn 14)

any idea what i could try at this point?
regards, gargarmel.