|
Fireball ST 4.3S
| Seven-Jumper Configuration |
There are seven jumpers on the Quantum
Fireball ST 2.1S, 3.2S, 4.3S,
and 6.4S drive printed circuit boards located as shown in
Figure 3-2. One of the jumper positions is reserved. The black
jumper
body indicates that a jumper is installed (the setting is ON).
The
jumper settings are described in Table 3-1. The SCSI bus
Termination
Enable (TE) jumper enables SCSI bus active termination on the
drive
when installed (TE=1). Only the two SCSI devices (including the
SCSI
host adapter) located at the ends of the SCSI bus should have
termination enabled. When removed (the PK position may be used
to
store the jumper), the termination circuit is disabled. In the
disabled
mode, each individual SCSI bus is electrically isolated from the
termination source. This method makes termination easier to
configure. A remote LED may be connected between the anode and
cathode pin locations on the jumper block. No external resistor
is
required—5-volt LED current limiting is provided internal to the
drive. |
Figure 3-2
3.5-Inch Seven-Jumper Locations and Settings
CAUTION: Verify that no two drives on
the SCSI bus have the same address
(see Table 3-1 for drive address information). |
Table 3-1 SCSI Jumpers
| SCSI Address
Jumpers |
SCSI ID |
| A2 |
A1 |
A0 |
|
| OFF |
OFF |
OFF |
0 |
| OFF |
OFF |
ON |
1 |
| OFF |
ON |
OFF |
2 |
| OFF |
ON |
ON |
3 |
| ON |
OFF |
OFF |
4 |
| ON |
OFF |
ON |
5 |
| ON* |
ON* |
OFF* |
6* |
| ON |
ON |
ON |
7 |
|
*Indicates the default jumper settings (SCSI Address = 6). |
Quantum Desktop Disk Drive SCSI Product Specifications
|
Model
(by Capacity) |
Quantum
Fireball ST
4.3S |
Drive Format:
Formatted Capacity *note1
Total Logical Blocks
Physical Heads
Physical Disks |
4,310.43 MB
8,418,816
6
3 |
Access Time:
Average Seek Time |
10 ms (Read) |
| Buffer Size |
128K *note 2 |
| Field MTBF (POH) |
400,000
(Projected) |
Dimensions:
Height (inches)
Width (inches)
Depth (inches) |
1.00
4.00
5.75 |
Power Consumption:
Idle
Typical (40% seek) |
4.8 W
7.4 W |
| Operating Temperature |
0°–55°C |
*note 1 - Quantum defines a
megabyte (MB) to be 1,000,000 bytes.
*note 2 - The upper 32K contains the drive firmware, while the
balance (96K) is allocated to hold
the data. For Fireball ST, the upper 54K is used for firmware
and the balance is used for
cache. |
|
