Description: Lot of 3x FLEXSTAR FS2500 ST-506 MFM HDD Hard Disk Drive Interface Controller boards As picturedEach controller has two PCBs stacked Not tested No returns The ST506 HDD was the first 5.25 inch hard disk drive, introduced in 1980[3] by Shugart Technology (now Seagate Technology). It stored up to 5 megabytes after formatting (153 cylinders, 4 heads, 26 sectors/track, 256 bytes/sector) and cost US$1,500 (equivalent to $5,328 in 2022).[4] The similar, 10-megabyte ST412 HDD was introduced in late 1981 (with 306 cylinders). The ST225 was introduced shortly thereafter with 20 megabytes and half the height. All three used MFM encoding, a widely used coding scheme. A subsequent extension of the ST412 interface, the ST412HP interface, used RLL encoding for a 50% increase in capacity and bit rate.The ST506 drive connected to a computer system through a disk controller. The ST506 interface between the controller and drive was derived from the Shugart Associates SA1000 interface,[5] which was in turn based upon the floppy disk drive interface,[6] thereby making disk controller design relatively easy.[3]
Price: 66.6 USD
Location: San Francisco, California
End Time: 2024-03-09T19:45:30.000Z
Shipping Cost: 14.95 USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
Vintage: Yes
