10 |
|
| Cheetah 36XL Product Manual, Rev. E |
SCSI interface data transfer rates (asynchronous): |
| ||
Maximum instantaneous 8 bit wide | 5.0 Mbytes/sec [4] |
| |
Maximum instantaneous 16 bit wide | 10.0 Mbytes/sec [4] |
| |
Synchronous formatted transfer rates: | Ultra2 SCSI | Ultra160 SCSI | |
In SCSI Wide (16 bit) |
| 10.0 to 80 Mbytes/sec | 10.0 to 160 Mbytes/sec [6] |
Sustainable data transfer rates: |
|
| |
Minimum |
| 23 Mbytes/sec |
|
Average |
| 33 Mbytes/sec |
|
Maximum |
| 37 Mbytes/sec |
|
Sector Sizes: |
|
|
|
Default | 512 byte user data blocks |
| |
Variable | 512 to 4,096 bytes per sector in even number of bytes per sector. | ||
| If n (number of bytes per sector) is odd, then | ||
Read/write consecutive sectors on a track |
| Yes | |
Flaw reallocation performance impact (for flaws reallocated at format |
| ||
time using the spare sectors per sparing zone reallocation scheme.) | Negligible | ||
Average rotational latency |
| 2.99 msec | |
Notes for Section 4.2.
[1]Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to the Initiator (excluding connect/disconnect).
[2]Typical access times are measured under nominal conditions of temperature, voltage, and horizontal ori- entation as measured on a representative sample of drives.
[3]Assumes no errors and no sector has been relocated.
[4]Assumes system ability to support the rates listed and no cable loss.
[5]Access time = controller overhead + average seek time.
Access to data = controller overhead + average seek time + latency time.
[6]Drive required to be in LVD mode to attain maximum transfer rates.
4.3Start/stop time
After DC power at nominal voltage has been applied, the drive becomes ready within 20 seconds if the Motor Start Option is disabled (i.e. the motor starts as soon as the power has been applied). If a recoverable error condition is detected during the start sequence, the drive executes a recovery procedure which may cause the time to become ready to exceed 20 seconds. During spin up to ready time the drive responds to some com- mands over the SCSI interface in less than 3 seconds after application of power. Stop time is less than 15 sec- onds from removal of DC power.
If the Motor Start Option is enabled, the internal controller accepts the commands listed in the SCSI Interface Product Manual less than 3 seconds after DC power has been applied. After the Motor Start Command has been received the drive becomes ready for normal operations within 10 seconds typically (excluding an error recovery procedure). The Motor Start Command can also be used to command the drive to stop the spindle (see SCSI Interface Product Manual, part number 75789509).
There is no power control switch on the drive.
4.4Prefetch/multi-segmented cache control
The drive provides prefetch (read
