Hitachi 100GB 7200 RPM HTE721010G9SA00 User Manual

Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification

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The Set Max FREEZE LOCK command allows the host to disable the SET MAX commands (including Set Max 
UNLOCK) until the next power cycle. When this command is accepted the device is in the Set Max Frozen mode.

The password, the Set Max security mode, and the unlock counter do not persist over a power cycle but persist over 
a COMRESET or software reset. 

NOTE: If this command is immediately preceded by a Read Native MAX ADDRESS command, it shall be 
interpreted as a Set Max ADDRESS command regardless of Feature register value.

HTE7210XXG9SA00 provide accurate seek time measurement method. The seek command is usually used to 
measure the device seek time by accumulating execution time for a number of seek commands. With typical 
implementation of the seek command, this measurement must including the device and host command overhead. To 
eliminate this overhead, HTE7210XXG9SA00 overlap the seek command as described below. 

The first seek command completes before the actual seek operation is over. Then device can receive the next seek 
command from the host but actual seek operation for the next seek command starts right after the actual seek 
operation for the first seek command is completed. In other words, the execution of two seek commands overlaps 
excluding the actual seek operation. 

With this overlap, total elapsed time for a number of seek commands is the total accumulated time for the actual 
seek operation plus one pre and post overhead. When the number of seeks is large, just this one overhead can be 
ignored.