Fujitsu MHY2120BH 用户手册

GL-2 

C141-E262 

The master is the first drive that can operate on the AT bus.  The master is daisy-
chained with the second drive which can operate in conformity with the ATA 
standard. 

Mean time between failures.  The MTBF is calculated by dividing the total 
operation time (total power-on time) by the number of failures in the disk drive 
during operation. 

Mean time to repair.  The MTTR is the average time required for a service person 
to diagnose and repair a faulty drive. 

Mode to transfer data under control of the host CPU 

Sum of the seek time and mean rotational delay 

The power save modes are idle mode, standby mode, and sleep mode. 

In idle mode, the drive is neither reading, writing, nor seeking data.  In standby 
mode, the spindle motor is stopped and circuits other than the interface control 
circuit are sleeping.  The drive enters sleep mode when the host issues the SLEEP 
command. 

Reserved bits, bytes, and fields are set to zero and unusable because they are 
reserved for future standards. 

Time delay due to disk rotation.  The mean delay is the time required for half a 
disk rotation.  The mean delay is the average time required for a head to reach a 
sector after the head is positioned on a track. 

The seek time is the time required for a head to move from the current track to 
another track.  The seek time does not include the mean rotational delay.