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Qume DataTrak 8 Manual de usuario Pagina 5

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GENERAL
The Qume DataTrak 8 Flexible Disk Drive is a low
cost
direct
access
data
storage device
that
utilizes a removable IBM
diskette or equivalent as storage medium.
It is compatible
with
the
following
IBM Diskette Drives.
Single Sided IBM 3740 and Systems
32
Drives; 33FD
Two-Sided IBM 3600 and 4964 Drive; 43FD
Two-Sided double
density
IBM System
34
DataTrak 8 provides a storage
capacity
of
0.6M Bytes on a
two
sided single
density
flexible disk, (IBM DISKETTE 2
or
equivalent) and 1.2M Bytes on the
two
sided double density
flexible disk, (IBM Diskette
2D
or equivalent).
The DataTrak 8 has a
two
sided head carriage assembly
containing two, proven ceramic read/write heads, .and a
flexured mounting arrangement
that
results in extremely high
reliability.
Faster access time (3ms
track
to
track) is accomplished by a
simple, precise steel belt drive
with
low power
dissipation
and
minimal wear.
Standard features include:
• Negative
DC
power supply not required
•
Up
to
4 drives can be daisy chained together
• ISO Write protect
• Program controlled door lock
•
LED
activity
indicator
on the front panel
The Datatrak 8 operates when mounted 2 drives horizontally,
or 3 vertically
within
a standard
19
inch rack and panel unit. A
single restriction is made when the drive is mounted
horizontally. The proper side must
be
up, as is described later
under MOUNTING.
DataTrak 8 provides both physical and electrical interface
compatibility
with
the Shugart
SA8S0.
SPECIFICATION SUMMARY
Performance Specifications
Single Density Double Density
Capacity per disk
Unformatted 0.8M Bytes
1.6M Bytes
IBM Format 0.6M Bytes 1.2M Bytes
Recording Density
3408BPI
6816
BPI
(Track No.
76)
Track Density
48
T P I
48
T P I
Number of Cylinders
77 77
Number of Tracks
154
154
Recording Method
FM
MFM
Rotational Speed
360 RPM 360 RPM
Transfer Rate 250K Bits/sec
500K Bits/sec
Latency (Average) 83
ms
83
ms
Access Time
Average
91
ms
91
ms
Track to Track
3
ms
3
ms
Settling 15
ms
15
ms
Head Load Time
35
ms
35
ms
Motor Start Time
2 sec 2 sec
1
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