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Most PC's today use IDE drives because they are
cheap, offer higher capacity and perform quite well for their intended
purpose. Many of us rule out SCSI as an option mainly due to the high
costs in operating such devices. SCSI drives are typically much more
expensive than IDE drives and also require additional hardware to operate
them. However, today we look at a low cost solution for those looking
for a high performance SCSI setup. We will be looking at the IBM
Ultrastar 36Z15 18.4GB 15K SCSI Drive with a LSI Logic U160 Host Adapter. How
much does this setup cost? How does it perform? The answers will
surprise you.
Let's take a closer look at the drive:
Features
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Rotational speeds of 15,000 RPM and average seek
time as low as 3.4ms to help boost performance.
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Capacities of 36 or 18GB provide configuration
flexibility.
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Utilizes technologies such as Drive Fitness
Test, load/unload, and glass substrate disks to enhance reliability and
robustness and to prolong the lifespan of the drive.
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large multi-segmented buffers
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sophisticated command queuing system
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hardware automation
And the full Specs:
|
Specifications |
|
Configuration
|
Ultra160 SCSI
|
|
|
Formatted capacity
(512 bytes) |
36.7 / 18.4GB |
|
|
Sector size (in bytes) |
512-528 (variable, 2-byte increments) |
|
Recording zones |
11/8 |
|
|
Data heads |
12/8 |
|
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Disks |
6/4
|
|
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Areal
density (maximum) |
10,700 Mbits/sq. in. |
|
|
Recording density
(maximum) |
397,000 BPI |
|
|
Track density |
27,000 TPI |
|
|
Performance |
|
Data buffer |
4096 KB |
|
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Rotational speed |
15,000 RPM |
|
|
Latency (average) |
2.00 ms |
|
|
Media transfer rate |
453-647 Mbits/sec |
|
|
Interface transfer rate |
160
MB/sec |
|
|
Sustained data rate |
36.6 - 52.8MB/sec |
|
|
Seek time |
|
Average |
4.2/3.4 ms |
|
|
Track to track |
0.65 ms |
|
|
Full track |
8.9/6.7 ms |
|
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Reliability |
|
Error rate
(nonrecoverable) |
10
in 10E16 bits read |
|
|
Start/stop cycles |
50,000 cycles |
|
|
Power |
|
Requirement |
+5VDC (±5%),
+12VDC (±5%) |
|
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Dissipation (typical) |
|
Startup (maximum peak) |
1.0A (5V),
2.5 A (12 V) |
|
|
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|
|
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Idle |
13.5 / 11.0 W |
|
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Power consumption
efficiency index |
0.0004 W/MB, 0.0006 W/MB |
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Dimensions |
|
Height |
25.7 (±0.4) mm |
|
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Width |
101.6 (±0.4) mm |
|
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Depth |
146
(±0.6) mm |
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Weight (maximum) |
0.75 kg |
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