USA Seller This 2GB IDE 40 PIN SSD Card & Adapter plugs onto the IDE cable to replace Worn Out AC11000 vintage 3.5 inch IDE hard drive. Geometry is 4066 Cylinders 16 Heads 63 Sectors so you can Exactly replace AC11000 with parameters of 2046 Cylinders 16 Heads 63 Sectors if your BIOS is fixed and not auto detect. Or with auto detect upgrade to 2GB SSD. These are only tested on windows PC's. Operation on other equipment not tested or implied. 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. You may have to set computer BIOS to boot from removable.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.-Works great! Plugged it in and computer recognized it right away. Was up and running in less than 5 minutes. Replaced an old 2GB spindle drive. Would definitely recommend and might purchase another one.- My fourth buy. Great buy and fast shipping. Thanks!- Arrived quickly and in good shape. Works great.- Working as describedhappy 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...... 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.