Shugart SA455 Manual

SECTION I
INTRODUCTION
1.1 GENERi\L DESCRIPTION
The SA455/465 Minifloppy Disk DrlvE!s are enhanced
double~headed, half~helght
versions of the ShuBarl SAIJOO
minifloppy drives. The SA455/46f> provides up to four Umes the on-line storage capacity, faster access time, nnd
improved reliability and maintainability'.
51\455/465
drives read and write in single and double density on standard 5.25 inch diskettes on both :sides of the
diskettes. The new drives are: half the height of the Shugart SA400 and are plug compatible.
The compact SA455/465 offers a reliable, low cost, high performance alternative to
OEM
data storage applica-
tions where tape cassette units wOUild bave been previously considered.
SA455/465 drives have these standard features: compact size'
~
1.62
Inches high
x
5.75 inches wiele
x
7.96
inches deep, and
a
weight of 3.3 pounds; low heat dissipation; de drive motor with precision servo speed control
(lnd integral tachometer; band positioner; same proprietary glass bonded ferrite/ceramic read/write head as used
in SIIllUml\ Imge floppy drives; Int,ernal write protect circuitry; activity light. and solid die eust chassis.
Typical applications for the SA455/465 are word processing systems, entry level micro-processor systems, in-
telligent calculators, program storagl:!,hobby computer systems, and other applications where low cost rilndoTl\ ac-
cess data storage is a requirement.
This manual prOVides depot level maintenance Informatk:m necessary to maintain, trouble-shoot, and repair the
SA455/465. A separate
OEM
manual
(PIN
39238) Is available which describes installation. interface.
,mel
power
requirements useful for the applications of the drive.
Key Features
a. 0.5 Mbytes (SA455) or 1.0 Mbyte (SA465) storage capacity (unformatted)
b. Low power (12.5 wallts)
c. 125/250 kbits/second transfer rate
d.
DC drive motor (eliminates ac requirements)
1.2 SPECIFICATION SUMM~lRY
1.2.1 Perfonnance Specifications
SA455 (40 Track)
Single
Densit~1
Double Density
(PM) (MFM)
SA465 (80 Trad')
Single Denstiy Double Density
(FM) (MFM)
Capacity
(in bytes)
Unformatted
Per Disk
Per Surface
Per Track
250,000
125,000
3,125
1·1
500,000
250,000
6,250
500,000
250,000
3,125
1,000,000
500,000
6,250