It was offered as a feature on certain models of the PS/2 and RS/6000. It was the first OEM disk drive to use MR Heads. IBM 0664 The 0664 first shipped in November 1992. Developed under the code name "Allicat" at IBM Rochester, MN, it was a full-height 5-inch HDD (3.25-inch high) that combined two 3-inch devices in one, with up to 2.013 GB capacity on up to 8 95 mm disks. IBM 0662 The 0662 first shipped in June 1993. Developed under the code name "Spitfire" at IBM Rochester, MN, it was a full-height (1-inch high) 3-inch HDD with 1.05 GB on 3 disks or 5 disk surfaces. It was the HDD internal to the 9336 Disk Unit and the 9337 Disk Array. Floppy disk drive Another important IBM innovation is the floppy disk drive. IBM first introduced the 8-inch FDD in 1971 as a read only program load device. In 1973 IBM shipped its first read/write floppy disk drive as a part of the 3740 Data Entry System. IBM established early standards in 8" FDDs but never sold such products separately so that the industry then developed separate from IBM. IBM was at one point was the world's largest purchaser of OEM 5-inch FDDs; its selection of the two-sided, 48 tpi model helped establish the model as the de facto industry standard. IBM made extensive preparations to manufacture such models and smaller form factors but cancelled all such efforts in 1985. IBM's 1983 attempt to OEM its 4-inch DemiDisk failed. "Star" series of HDDs On October 17, 1994, IBM's Storage Systems division announced three new families of hard disk drives, the Travelstar 2-inch family for notebooks, the Deskstar 3-inch family for desktop applications and the Ultrastar 3-inch family for high performance computer system applications. IBM's first HDD versus its last HDDs The following table compares IBM's first HDD, the RAMAC 350, with the last three models it manufactured in each of its "Star" series of OEM HDDs. It illustrates HDD's spectacular decline in cost and size along with corresponding improvement in capacity and performance. DASD devices not HDDs or FDDs IBM in some of its operating systems classifies HDDs and FDDs as DASDs, direct access storage devices. Other technologies so classified include: IBM 7320 drum The IBM 7320 is a magnetic drum storage unit announced in 1962. IBM 2301 drum The IBM 2301 is a magnetic drum storage