first shipped in August 1986. Developed at IBM Rochester, MN, under the code name "Grant", it was a 70 MB ESDI full height 5-inch HDD with up to 4 130 mm disks. It was offered as a feature on certain models of the PC RT (6150, 6151, 6152) and in System/36 Model System Units (5363, 5364). IBM 0669 The 0669 first shipped in 1987. Developed at IBM Rochester, MN, under the code name "Grant-Prime", it was a full-height 5-inch HDD with a capacity of up to 115 MB on up to 4 130 mm disks. It was the HDD internal to the System/36 5363 System Unit and Series 1 4956 System Unit. IBM 0671 The 0671 first shipped in 1987. Developed under the code name "Lee" at IBM Rochester, MN, it was an up to 316 MB ESDI full height 5-inch HDD with up to 8 130 mm disks depending upon model. This was IBM's first usage of a thin metal film as the disk's recording surface. In 1988 it shipped as part of the 9404 System Unit of the IBM AS/400 system which contained two, or optionally three of these HDDs. IBM 0661 The 0661 first shipped in 1989 as the model 371. Developed initially under the code name "Lightning" at IBM Rochester MN (and IBM Hursley, UK) as a 320 MB SCSI HDD with up to eight 95 mm disks (14 heads), it was followed in 1990 with a 400 MB version, code named "Turbo". During 1990 it was added as a standard drive on several major IBM systems, e.g., IBM AS/400 System Unit Model CXX. IBM 0681 The 0681 first shipped in April 1990. Developed at IBM's Hursley, UK, laboratory under the code name Redwing, it was the last HDD product developed at Hursley. It was an up to 857 MB full height 5-inch HDD using up to 12 130 mm disks. It was the first HDD to use PRML decoding of data. It was the drive component of the 9333 Disk Drive Subsystem which first shipped in early 1992. A higher density, 1.07 GB, version was incorporated into the 9333 subsystem in May 1992. IBM 0663 The 0663 first shipped in late 1991. Developed under the code name "Corsair", it was a 3-inch HDD with the height of a 5-inch half-height device (1.6-inch high) and up to 1 GB on up to 8 95 mm disks.