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Disk
Data Transfer Rate
Maximum sustained
250-MB cartridge
100-MB cartridge
Read
Write
Burst (both cartridges)
Seek Time (Includes Settling Time)*
Minimum
Average
Maximum
Latency (Average Rotational Delay)
Spindle speed
Track-to-track access time**
Average head switch time
Head reload time †
Start-Stop Time (Average) ‡
Start
Stop
* Seek time does not include latency or head switch time. Average seek time is the average time of a random
seek.
** Time from end of last sector on a track to start of next sequential sector on the next track.
#
Time to switch track following on one data surface and establish track following on other data surface. The
average head/switch time is measured over 1,000 accesses (head switches occur for only one-half of random
accesses).
† Time required for the head to establish track following from the parked position.
‡ Start time is time from disk insertion to time drive is ready to process commands. The typical spin up time
for a cartridge that has spun down without ejecting is three seconds. If the drive has difficulty spinning up the
motor or reading the z-tracks, it will automatically retry the operation. Software that is waiting for the drive to
spin up should set timeouts to no less than 15 seconds to allow time for all retries. Stop time is the elapsed
time between pushing the cartridge eject button and the time the solenoid releases the disk.
Table 6-9
250-MB Zip Drive
Specifications
2.4 MB/s
1.4 MB/s
0.25 MB/s
11.11 MB/s
4 ms
29 ms
56 ms
2941 rpm
5 ms
11 ms
700 ms
5 seconds
2 seconds
Specifications 6-11
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