This 2GB IDE 40 PIN CF SSD Card & Adapter plugs onto the IDE cable to replace a ST31081A vintage 3.5 inch IDE hard drive. Geometry is 4066 Cylinders 16 Heads 63 Sectors so you can Exactly replace ST31081A with parameters of 2097 Cylinders 16 Heads 63 Sectors if your BIOS is fixed and not auto detect. Or with auto detect upgrade to 2GB SSD. Tested good before shipping. ASK QUESTIONS BEFORE BUYING as NOTHING CAN BE CHANGED once purchased and paid for. Listing is for 1 drive each at this price. No trays are included all drives are bare drives. No local pickups allowed. Drives are Completely Blank and will need partition and format or operating system installed to be a working drive to the computer. 

REVIEWS -

-  Great item so thanks! Worked like a charm and auto-detected to boot. Installing DOS 6.22 on an HP Vectra P75 as I write this. Will buy again.

- My fourth buy. Great buy and fast shipping. Thanks!

- Arrived quickly and in good shape. Works great.

- Working as described happy with the service, arrived quickly. Will buy another one.

- Worked great in an old computer that was over 25 years old that I still had a use for. A+

- Very pleased, buying 2 more for other systems...... "Replace Seagate" SSD was used to rebuild a DOS6  Windows 3.1 system with FAT. It required 2GB or smaller HD and this worked perfectly. Nothing is known of reliability but we expect better odds than with 30+ years on a used HD.