Exabyte EXB-8505 8mm manual Performance Specifications, Write and Read Access Times

6Functional Specifications

Performance Specifications

This section describes the performance specifications for the tape drive.

Write and Read Access Times

Write access time starts when the tape drive receives the last byte of the WRITE command (that is, when the initiator de-asserts ACK) and ends when the tape drive asserts REQ to request that the initiator transfer the first data byte across the SCSI bus.

Read access time starts when the tape drive receives the last byte of the READ command (that is, when the initiator de-asserts ACK) and ends when the tape drive asserts REQ to indicate that it is ready to transfer the first data byte across the SCSI bus to the initiator.

Write and read access times depend on whether the tape drive is operating in start/stop mode or streaming mode.

Table 6-1Typical write and read access times

Mode	Typical write access	Typical read access
	time	time
Start/stop	1.7 msec	1.8 msec
Streaming	3.1 msec	3.2 msec

Note: The measurement of write access time does not include the initial WRITE command received after the mode is changed from read to write.

6-2	EXB-8205 and EXB-8505	510504
	(Standard and XL)