Hitachi HDS728080PLAT20 Specifications - Page 33
Operating modes
UPC - 829686000094
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D = Average sustained disk-buffer transfer rate (byte/s) E = Buffer-host transfer rate (byte/s) 4.5.6 Operating modes 4.5.6.1 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. 4.5.6.2 Mode transition time Table 16: Mode transition times From To Standby Idle Standby Sleep Unload idle Idle Low RPM Idle Idle Standby Sleep Standby Idle Unload idle Idle RPM 0 ---> 7200 7200 ---> 0 0 0 7200 7200 4500 ---> 7200 Transition time (sec) Typical 6 Immediately Immediately Maximum 20 Immediately Immediately Immediately Immediately 0.7 20 0.7 20 3 20 Note: The command is processed immediately (within 1ms) but there will be an actual spin down time reflecting the seconds passed until the spindle motor stops. Deskstar 7K80 Hard Disk Drive Specification 29