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General Information
The
following
documentation,
which
may
be
ordered
from
the nearest
Hewlett-Packard
Sales
and
Support Office
listed
in
the rear of
this
manual,
provides additional
information on
the
operation
and
service
of
the
individual
components
of the
drive:
•
HP7911
,
7912
,
and
7914
Disc
/Tape
Drives
Service
Manual
part
no.
07912-90903.
•
HP
9 144
A
Tape
Drive
Service
Manual,
part
no.
09144-90030.
•
CS/80
Instruction
Set
Programming
Manual,
part
no.
5955-3442.
•
CS/80
External Exerciser Manual, part
no.
5955-3462
1-5.
OPERATING
SPECIFICATIONS
Disc drive
performance
Average controller overhead
tine:
4.0 ns
Average seek
tine:
28.1 ns
Average rotational delay:
8.3 ns
Average
tine to transfer
1
kbyte:
1,2
ns
Total average transaction
tine:
41.6 ns
(excluding systen overhead)
Maximum disc transactions per
second,
for
1
kbyte transfers,
less systen overhead:
24.0*
* Refers
to
fundamentat
disc
performance;
true
I/O
rates
must
include
the
individual
system
configuration
specifications
and
are application dependent.
Disc drive storage capacity
Data
Data Bits Per
Data
Bytes
Sectors
Tracks
Capacity
Per
Per
Per
Byte
8
Sector
2,048
256
Track
131,072
16,384
64*
7914 Head
150,994,944
18,874,368
73,728
1,152**
7914CT***
1,056,964,608
132,120,576
516,096
8,064
*
Total
number
of sectors
per
track
is
65,
one
is
a
spare.
** Total number
of tracks
per
head
is
1,164; eight
are
spares
for
defective
track
allocation
and
two
are
maintenance
tracks.
Two
additional tracks are
reserved
for
future
use.
***
The
HP
7914CT
utilizes
two heads per
surface.
Tape
drive
performance
Tape Read/Write
Speed:
60
ips
Tape Search/Rewind
Speed:
90
ips
Data
Transfer
Rated-:
2
Mbytes/minute
+
Maximum
sustained transfer
rate
does
not necessarily
reflect
system throughput which
varies
depending
upon
application,
file
structure
and
host/tape
driver
implementation.
Tape
drive storage capacity
Data
Bits Per
Bytes Per
Frames
Blocks Tracks
Capacity
Per
Per
Per
Byte
8
Frame
2,048
256
Block
8,192
1,024
4*
Track**
33,488,896
4,186,112
16,384
4,088***
Tape**
535,822,336 66,977,792 262,144 65,408*
16
*
Total
number
of
frames per
block
is
6 (4
frames
for
data
and
2
for
data
recovery).
**
600
foot cartridge
***
Total
number
of blocks
per
track
is
4,096,
8 are used for
spares.
+
Total
number
of blocks
per
600
foot cartridge
is
65,776;
128
are spares
and 240
are
maintenance
blocks.
1-6.
OVERALL
CHARACTERISTICS
Interface
HP
-IB
using
CS80
protocol
Electromagnetic
emissions
Radiated and conducted
interference:
U.S.A.:
designed
to
meet
FCC
Rules Part
15,
Class
A
computing
devices requirements.
Europe:
designed
to
meet
VDE
0871
for
level
A
computing
devices.
FTZ
licensed
on
some
HP
systems.
Refer
to
your
local
sales
representative for
more
information.
Sound
emission
Sound
power: 63
dBA
Sound
pressure:
50
dBA
Power
requirements
Voltage
Current
Current
Range*
(47.5-to-55
Hz)
(54-to-66 Hz
100
Volts
8.8 Amps
8.0
Amps
120
Volts
7.4 Amps
7.0
Amps
220
Volts
4.0 Amps
-
240
Volts
3.7 Amps
-
*
All
voltages
+5%,
-
10
Power
~
7
00
Watts
1-2
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