Hitachi 7K400 Specifications - Page 30
Drive ready time
UPC - 000053412935
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4.5.2.3 Head switch time (head skew) Head switch time-typical (ms) 1.4 Head switch time is defined as the amount of time required by the fixed disk to complete a seek of the next sequential track after reading the last sector in the current track 4.5.2.4 Cylinder switch time (cylinder skew) Cylinder switch time is defined as the amount of time required by the fixed disk to access the next sequential block after reading the last sector in the current cylinder. The measuring method is given in Section 4.5.5, "Throughput" on page 18. 4.5.2.5 Single track seek time (without command overhead, including settling) Table 8: Single Track Seek Time Function Typical (ms) Max (ms) Read 0.8 1.5 Write 1.3 2.0 Read (Quiet Seek mode) 0.8 1.5 Write (Quiet Seek mode) 1.3 2.0 Single track seek is measured as the average of one (1) single track seek from every track in both directions (inward and outward). 4.5.2.6 Average latency Table 9: Latency Time Rotational speed (RPM) 7200 RPM Time for one revolution (ms) 8.3 Average latency (ms) 4.17 4.5.3 Drive ready time Table 10: Drive ready time Typical (sec) Power on to ready 20 Maximum (sec) 31 Ready The condition in which the drive is able to perform a media access command (for example- read, write) immediately. Power onThis includes the time required for the internal self diagnostics. Note: Max Power On to ready time is the maximum time period that Device 0 waits for Device 1 to assert PDIAG. Deskstar 7K400 Hard Disk Drive Specification 16