Hello linux guys, after wandering on several docs I had to recognize that for both of my UDMA drives (IBM 4.3 and Quantum EL 7.6GB) the UDMA feature slow them down rather than speed them up. More, the strange thing is that I got different speeds at any boot (same set of running services). Ok, I can see tolerances in speed recognition, but is there anything but kernel and hdparm settings which can change their speed? I found the following setting giving good results: hdparm -p -c1 -d0 -m16 -W1 /dev/hda (IBM, giving about 7,7 MB/s) and the same for hdb Quantum, giving about 11 MB/s. Any idea on getting better results? What about a scsi device (Quantum Atlas 18.2 SCSI2)? How can I speed it up? (hdparm -t gives about 20MB/s) Ciao e grazie, Stefano