Seagate ST12450W, Product Manual

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ST12450W/WD Product Manual, Rev. A v
Contents
1.0 Scope ................................................................................................................................. 1
2.0 Applicable standard and reference documentation ....................................................... 3
2.1 Standards ..................................................................................................................... 3
2.2 Applicable reference documents ................................................................................... 3
3.0 General description ........................................................................................................... 5
4.0 Standard features .............................................................................................................. 7
4.1 Performance ................................................................................................................. 7
4.1.1 Reliability ............................................................................................................. 7
4.2 Unformatted and formatted capacities .......................................................................... 8
4.3 Options (factory installed) ............................................................................................. 8
4.4 Optional accessories..................................................................................................... 8
4.5 Installation ..................................................................................................................... 9
5.0 Performance characteristics ............................................................................................ 11
5.1 Internal drive characteristics ......................................................................................... 11
5.2 SCSI seek performance characteristics ........................................................................ 11
5.2.1 Seek time ............................................................................................................ 13
5.2.2 Format drive command execution time ................................................................ 13
5.3 General performance characteristics ............................................................................ 14
5.4 Start/stop time ............................................................................................................... 15
5.5 Prefetch/multi-segmented cache control ....................................................................... 15
5.5.1 Adaptive read lookahead ..................................................................................... 16
5.6 Caching write data ........................................................................................................ 17
5.7 Synchronized spindle operation .................................................................................... 17
6.0 Reliability specifications ................................................................................................... 21
6.1 Error rates ..................................................................................................................... 21
6.1.1 Environmental interference .................................................................................. 21
6.1.2 Write errors ......................................................................................................... 21
6.1.3 Seek errors ......................................................................................................... 22
6.2 Reliability and service ................................................................................................... 22
6.2.1 Mean time between failures (MTBF) .................................................................... 22
6.2.2 Air flow ................................................................................................................ 22
6.2.3 Preventive maintenance ...................................................................................... 26
6.2.4 Service life........................................................................................................... 26
6.2.5 Service philosophy .............................................................................................. 26
6.2.6 Installation ........................................................................................................... 26
6.2.7 Service tools........................................................................................................ 26
6.2.8 Hot plugging Barracuda 2, 2HP disc drives ......................................................... 26