Jeff Garzik is the kernel maintainer for libata, the
driver you'll need for sata disks. He has a website
with pages for
Serial ATA (SATA) for Linux.
I would suggest you read through his information
about different SATA drivers and RAID controllers.
This will save you a lot of headache, heartache,
and money in the long run.
But may I ask: Why don't you just get new SCSI
discs, since you know they work, and they're faster
than SATA?
If you use Slackware-10.1 it defaults to the 2.4.29
kernel which has a sata.i kernel available. I don't
know what you mean about using 2.4.26, but it's
not available when you install Slack-10.1 ...