Specifications
6-9
Zip Drive
Table 6-7
100-MB Zip Drive
Disk
Specifications
Data Transfer Rate
Sustained
Up to 11.2 Mb/sec
Burst
Up to 88.9 Mbs/sec
Seek Time (Includes Settling Time)*
Minimum
4 ms
Average
29 ms
Maximum
55 ms
Latency (Average Rotational Delay)
10.2 ms
Spindle speed
2941 rpm
Track-to-track access time**
5.0 ms
Average head switch time
#
11.0 ms
Head reload time †
200.0 ms
Start-Stop Time (Average)
‡
Start
3 seconds
Stop
2 seconds
* 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.
