The Disk 146.8GB, U320, 10k / 357915-001 is a high-capacity, rackmounted Winchester disk with a recording density of nearly 11 Mbits per square inch, providing a formatted capacity of 456 Mbytes (627 Mbytes unformatted).* The read/write system employs an encoding/decoding scheme that yields one-third more storage capacity than drives using conventional encoding. Position information on a dedicated servo surface enables high-speed seeking. Additional position information is embed- ded between sectors on every track for high-precision positioning. The RA81 operates with any member of the high-performance SDI controller family. The Disk 146.8GB, U320, 10k / 357915-001 features outstanding data reliability characteristics including an industry-leading 170-bit error correction code (ECC) and over 17,000 spare sectors for dynamic defect compensation. Low-cost three- and four-drive con- figurations provide almost 1.4 gigabytes and over 1.8 gigabytes of formatted storage, respectively, in only 1.68 square meters (5.5 square feet) of floor space. The Disk 146.8GB, U320, 10k / 357915-001-CA/CD stand-alone unit comes in the top bay of a 91.4-centimeter (36-inch) deep cabinet. Two additional drives (RA81s or RA60s in any combina- tion) can be mounted in the middle and bottom cabinet bays. The RA81 FA/FD - comes in a 154-centimeter (60.5-inch) high Disk 146.8GB, U320, 10k / 357915-001 cabinet with four mounting bays. Three additional drives (any combination of RA81s or RA60s) can be mounted in the Disk 146.8GB, U320, 10k / 357915-001. The Disk 146.8GB, U320, 10k / 357915-001 HA/HD is available as part of an integrated - Disk 146.8GB, U320, 10k / 357915-001 11/83 system using the H9642 JA/JB cabinet. The RA81 AA/AD - - - rackmountable drive can be added to the older H9642 BM/BN shallow cabinet, - as well as to newer H9642 A and H9646 cabinets. One BC26V 3.7-meter (12- - foot) cable is included with every drive or subsystem to connect the RA81 to any Disk 146.8GB, U320, 10k / 357915-001 controller. • Capacity (formatted): 456 Mbytes • Capacity (unformatted): 627 Mbytes • Peak transfer rate: 2.2 Mbytes/s • Average access time: 36.3 ms • Average seek time: 28 ms • Average latency time: 8.33 ms • Dual access: Standard • Media surfaces: 7 data, 1 servo • Tracks per surface: 2,496 • Sectors per track: 51 • Bytes per sector: 512 • Single-track seek: 6 ms • Rotational speed: 3,600 rpm • Drives per UDA50 or KDA50 controller: 4 • Drives per H9642 stand-alone cabinet: 3 • Drives per Disk 146.8GB, U320, 10k / 357915-001 stand-alone cabinet: 4 *Unformatted capacity provided for comparison purposes; only formatted capacity is user accessible in any disk device.