Hello, sis5513.c is finally working here accross several cold/warm reboots. The system is now running md5sum over huge files in UDMA 5 transfer mode simultaneously on 2 drives without error for the last hour. If you want (sis ide and ATA/100 -> you want) to test it, apply the attached diff (done against 2.4.17, ask me if you want a patch against another version) or copy http://gyver.homeip.net/sis5513.c to your [linux-src]/drivers/ide directory Please report any success/failure. In case of failure, please send me your kernel SIS5513 boot messages. As usual, you should backup your data before using this driver, ... LB.