Michael St. Laurent wrote: >>I did the same (changed the speed in the BIOS settings) and it's >>working. I tried it at 80 but I think I'm going to bump it to 160 and >>see if it works. > > > The 160 speed works as well for me. It seems that only the 320 speed > causes a problem. Which is interesting because Dell says that the drive > should be able to operate at 320 as well. I remember that the aic79xx driver has a known problem with timing at U320, but I'm no longer able to find the reference on the web (but that just a limitation in me finding the proper keywords to search for). This problem has been there for a long time, at least since OS version 3.0, but was never resolved. Apparently, it's still there in CentOS5. (and it's not a CentOS problem, the references I found a couple of years ago referred to the upstream's version). The 2TByte limitation is documented for Adaptecs: it does not do the 64-bit addressing on the SCSI bus, so there moving to LSI is indeed the only option. DavidG. -- David Groep ** National Institute for Nuclear and High Energy Physics, PDP/Grid group ** ** Room: H1.56 Phone: +31 20 5922179, PObox 41882, NL-1009DB Amsterdam NL **