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Hdd_dsa.txt
3 1/2-INCH
540 MB and 720 MB LOW PROFILE DISK DRIVES
MODELS
DSAA-3540, 3720
DSAS-3540, 3720
_______________
AN OEM OFFERING FROM IBM
This family of drives brings IBM's industry-leading
Magneto-Resistive head technology to the desktop computer
marketplace, offering superior performance and outstanding
reliability. IBM's well-proven advanced head and disk
technology delivers higher capacities--up to 365 MB per
disk on these models--with fewer components.
Today's desktop PC users are demanding more performance
and higher capacities to effectively manage database,
spreadsheet, desktop publishing, and graphic applications
in multitasking environments. The mainstream market is
embracing 540 MB and larger disk drives at an accelerating
pace. IBM is already there with this family of drives.
The higher areal density (358 b/sq in) gives a higher
average data rate with reduced "tail-off" on the inner
bands.
These 3.5" drives spin at 4500 RPM and operate at an average
access time of 12 ms. The high linear recording density
provides an outstanding minimum sustained data rate of
2.5 MB/sec. Performance is further enhanced by a 128 KB
segmented buffer (256 KB option) with write cache and read
look-ahead.
The drives are available with either ATA-2 (11.1 MB/sec)
or Fast SCSI-2 (10.0 MB/sec) interfaces. The AT* drives
support LBA mode and extended cylinder addressing in
addition to low power dissipation, AT and SCSI power
management commands for "Green PC" applications are also
supported.
QUALITY AND RELIABILITY
In line with IBM's outstanding commitment to quality,
reliability is again improved to over 300,000 power-on
hours MTBF.
These drives undergo extensive testing to ensure
compatibility across a broad spectrum of hardware platforms
and operating systems.
HIGHLIGHTS
- 540 MB and 720 MB capacities
- 12 ms average seek
- 4500 RPM spin rate
- Low power--2.7 W at idle
- ATA-2 and SCSI-2 F interfaces
- AT interface data rate of 11.1 MB/sec (P10 Mode-3)
- SCSI-2 F interface data rate of 10.0 MB/sec
- 300,000 power-on hours MTBF
Page 1
Hdd_dsa.txt
- 128 KB segmented data buffer (256 KB option)
- Write cache
- ECC on-the-fly
- MR head technology
PRODUCT DESCRIPTION
_______________________________________________________________________________
3 1/2" 540 MB and 720 MB Disk Drive DSAA-3540/ 3270 DSAS-3540/ 3720
_______________________________________________________________________________
Configuration
Interface ATA-2 (IDE) Fast SCSI-2
Device Capacity
Formatted 548/730 MB (1)
Sector Size 512 Bytes
Recording Zones 8
User Cylinders 3875
Data Heads 3/4
Disks 2/2
Areal Density
Maximum 358 Mb/sq in
Recording Density
Maximum 83,200 BPI
Track Density 4300 TPI
_______________________________________________________________________________
Performance
Rotational Speed 4500 RPM
Media Data Rate 32.5-44.6 Mbits/sec
Interface Transfer Rate
Maximum 11.1 MB/sec 10.0 MB/sec
(P10 Mode-3) (sync)
Data Buffer
Read Look-Ahead and Write 128 (2) KB
(256 KB option)
Latency
Average 6.67 ms
Seek Time (Typical Read)
Average 12 ms
Track to Track 4 ms
Full Track 25 ms
_______________________________________________________________________________
Reliability
MTBF
Projected power-on hours 300,000
Error Rates
Non-Recoverable Errors < 1 per 1.0E13 Bits Transfer
_______________________________________________________________________________
Power
Requirements +5 VDC +/- 5%,
+12 VDC + 10% - 8%
Dissipation (typical)
Start-up (Maximum Peak 15.7 Watts
Seek (Average) 4.8 Watts
Idle (Average) 2.7 Watts
_______________________________________________________________________________
Physical Size
Height 25.4 mm
Width 101.6 mm
Depth 146 mm
Weight
Maximum 530 g
_______________________________________________________________________________
Operating Non-Operating
Page 2
Hdd_dsa.txt
_______________________________________________________________________________
Environmental Characteristics
Ambient Temperature 5 to 55 degrees C -40 to 65 degrees C
Relative Humidity
Non-Condensing 8% to 90% 5% to 95%
Maximum Wet Bulb
Non-Condensing 29.4 degrees C 35 degrees C
Shock
Half-sine-wave 30 G/4 ms 75 G/11 ms
Vibration
Random (RMS) 0.67 G (5-500Hz) 1.04 G (2-200 Hz)
_______________________________________________________________________________
(1) 1 MB=1,000,000 Bytes
(2) Upper 32 KB used for firmware
Product Description data represents IBM's design objectives and is
provided for comparative purposes; actual results may vary depending
on a variety of factors. This product data does not constitute a
warranty. Questions regarding IBM's warranty terms or methodology
used to derive this data should be referred to your IBM representative.
Data subject to change without notice.
Copywrite International Business Machines Corporation 1994
* AT is a trademark and IBM is a registered
trademark of International Business Machines Corporation.
Page 3
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