Hitachi 7K250 Specifications - Page 34
Operating modes
UPC - 000004558972
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B = Average seek time (sec) C = Latency D = Average sustained disk-buffer transfer rate (byte/s) E = Buffer-host transfer rate (byte/s) 4.4.6 Operating modes 4.4.6.1 Description of operating modes Table 15: Description of operating modes Operating mode Spin-up Seek Write Read Unload Idle Idle Standby Sleep Description Start up time period from spindle stop or power down. Seek operation mode Write operation mode Read operation mode Spindle rotation at 7200 RPM with heads unloaded. Spindle motor and servo system are working normally. Commands can be received and processed immediately. Actuator is unloaded and spindle motor is stopped. Commands can be received immediately. TActuator is unloaded and spindle motor is stopped. Only soft reset or hard reset can change the mode to standby. Note: Upon power down or spindle stop a head locking mechanism will secure the heads in the OD parking position. 4.4.6.2 Mode transition time Table 16: Mode transition time From Standby Idle Standby Sleep Unload idle Idle To Idle Standby Sleep Standby Idle Unload idle RPM 0 ---> 7200 (3disks) 7200 ---> 0 0 0 7200 7200 Transition time (sec) Typical Maximum 9 31 Immediately Immediately Immediately Immediately Immediately 0.7 0.7 Immediately "Immediately" means within 1ms. Note: The command is processed immediately but there will be an actual spin down time reflecting the seconds passed until the spindle motor stops. Deskstar 7K250 Hard Disk Drive Specification 20