Arghhhhhhhh! After much wailing and gnashing of teeth, I am the proud owner of a Dell PowerEdge 1300 with a Promise FastTrak 100 TX4 running 4x40GB WD disks in a 0+1 configuration, ATA100! The clue was the last email message I saw on the list: https://listman.redhat.com/pipermail/ataraid-list/2002-January/000511.html In there was a link to http://www.spinics.net/lists/raid/msg00220.html which contained a link to http://www.linuxdiskcert.org. Right there, was a patch from the Man himself, Andre The IDE God. When patched into a stock 2.4.16 kernel, all my "Lost Interrupt" problems went away, and I am now a very happy man. Performance is very good. Example: ahab# time dd if=/dev/zero of=bigfile count=3000k 3072000+0 records in 3072000+0 records out 4.88user 29.82system 1:21.07elapsed 42%CPU (0avgtext+0avgdata 0maxresident)k 0inputs+0outputs (167major+31minor)pagefaults 0swaps I was not able to use hdparm -Tt on that drive. So, thank you Andre for the patch, and thank you Bas van Loon for the hint that has taken me to my happy place. Jdremy -- Jeremy Worrells jworrells@xxxxxxxxxxxxx 801.270.8616