CPU Galaxy on Twitter: "IDE RAID 1 on a 486? Yes, its possible. With this rare Tekram DC-680T controller, a pair of Seagate ST3660A 520MB HDDs, and a 486 at 100MHz. Next
Seagate ST3660A 545.5MB IDE/P-ATA 3,5" 3800RPM Vintage Hard Drive MEDALIST ! - Retro PC Store
SEAGATE ST3660A 545.5MB HARD DRIVE
Seagate Medalist (ST3660A) 550MB, 3800RPM, 3.5" Internal Hard Drive – Anand International Inc.
Refurbished: ST3660A-4 SEAGATE 545.5MB 3.5INCH HARD DRIVE Desktop Internal Hard Drives - Newegg.com