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IBM OEM STORAGE PRODUCTS
DSAS-3270, DSAS-3360, DSAS-3540 & DSAS-3720
IBM OEM has introduced a new range of disk drives for the desktop personal computer
marketplace. Available in four popular capacity points with SCSI-2 FAST interface, the
drives provide excellent performance and improved reliability.
APPLICATIONS
Desktop personal computers
Low-end file servers
Low-end workstations
FEATURES
281, 365, 548, and 730 MB formatted capacity
(512 byte/sector)
10 MB/s data transfer speed
44.5 Mb/s (OD)media data rate
32.5 Mb/s (ID) media data rate
Average seek time 12ms (Read)
4500 RPM
192 KB segmented buffer
Read ahead caching with LFU (Least Frequently Used) segment update
Industry standard mounting
The drive can be mounted with any of its six surfaces facing down
Enhanced ECC implementation
Power saving modes
Robust design for EMC/RFI
MR (Magneto Resistive) head technology
BENEFITS
Generic range of popular storage capacities
Fast interface data rate
Excellent performance on long records
Fast access to data
Fast data retrieval in (option 96 KB) multi-tasking applications
Ease of installation
Improved data throughput
Reduced power consumption
Easy integration across multiple platforms
High area density, low component count
Assured reliability
CONNECTORS
Pin 1
SCSI I/F Power
Connector Connector
Pin 2
Power
Connector
JP7
Option Block
JP1 Back Side of Drive
SCSI I/F
Connector
Logic Card
The DC power connector is
designed to mate with AMP part 1-480424 (using AMP pins PN 350078-4). Equivalent
connectors may be used. Pin assignments are shown below, as viewed from the end of the
drive.
Pin# 1 2 3 4
+5V GND GND +12V
SCSI SIGNAL CONNECTOR
The SCSI Signal Connector is a 50-pin connector meeting the ANSI SCSI specification.
Note: It is intended that the hard disk drive should only be in electrical contact with the
chassis of the PC at a designated set of mounting holes. Other electrical contact may degrade
error rate performance. As a result of this it is recommended that there should be no metal
contact to the hard disk drive except at the mounting holes or the side rails into which the
mounting holes are tapped.
OPTION BLOCK
Jumper Setting
Jumper position and function are as shown below. Pin pitch is 2mm.
The jumpers control SCSI Device ID, Auto Spin Up, Unit Attention, SCSI Terminator
Connection, and Target Initiated Synchronous Negotiation.
Disable Disable
Unit TI
Device ID Attention Negotiation
JP1 JP2 JP3 JP4 JP5 JP6 JP7
1 3 5 7 9 11 13
2 4 6 8 10 12 14
Disable Enable
Auto Terminator
Spin-up Notes:
1. The jumper position of JP1, 2, and 3
define SCSI ID of the drive.
If JP1,JP2,JP3,are Off, Off, Off, the SCSI ID is 0. (Shipping Default).
If JP1, JP2, JP3, are On, Off, Off, the SCSI ID is 1.
If JP1, JP2, JP3, are Off, On, Off, the SCSI ID is 2.
If JP1, JP2, JP3, are On, On, Off, the SCSI ID is 3.
If JP1, JP2, JP3, are Off, Off, On the SCSI ID is 4.
If JP1, JP2, JP3, are On, Off, On, the SCSI ID is 5.
If JP1, JP2, JP3, are Off, On, On the SCSI ID is 6.
If JP1, JP2, JP3, are On, On, On, the SCSI ID is 7.
2. If JP4 is Off, the drive will spin up automatically after power on reset. If JP4 is On, the
drive will not spin up unless the host system issues a start command to the drive.
3. If JP5 is On, Unit Attention after power on reset or SCSI bus reset is disabled.
4. If JP6 is On, the internal SCSI terminator works.
5. If JP7 is On, Target Initiated Synchronous Negotiation is disabled, and then the Initiator is
required to start a negotiation handshake if Synchronous SCSI transfers are desired.
DEFAULT SETTING
The default jumper setting at shipment is as follows.
OPERATING ENVIRONMENT
Operating Conditions
Temperature 5 to 55 degrees C
Relative Humidity 8 to 90% noncondensing
Maximum Wet Bulb
Temperature 29.4 degrees C noncondensing
Maximum Temperature
Gradient 20 degrees C/hour
Altitude -300 to 3048m
Nonoperating Conditions
Temperature -40 to 65 degrees C
Relative Humidity 5 to 95% noncondensing
Maximum Wet Bulb
Temperature 40 degrees C noncondensing
Maximum Temperature
Gradient 20 degrees C/hour
Altitude -300 to 12,000m
Note: The system is responsible to provide sufficient air movement to maintain surface
temperature below 60 degrees C at the center of top cover of the drive.
Operating Shock
The hard disk drive meets the following criteria while operating in respective conditions
described below. The shock test consists of five shocks inputs in each axis and direction for
total of 30. There must be a delay between shock pulses, long enough to allow the drive to
complete all necessary error recovery procedure.
No Data Loss, Seek Errors or Permanent Damage
10G, 11ms half-sine shock pulse
No Data Loss or Permanent Damage
15G, 5ms half-sine shock pulse 30G, 4ms half-sine shock pulse
Operating Vibration
Due to the complexity of this subject we recommend that users contact the IBM technical
support group representative to discuss how to perform the necessary measurements if they
believe this to be an area which requires evaluation.
DATA ORGANIZATION
Logical Layout DSAS-3270 DSAS-3360 DSAS-3540 DSAS-3720
Number of Heads 2 2 3 4
Number of LBAs 549504 713472 1070496 1427328
Sector Size 512 512 512 512
Total Customer 281 MB 365 MB 548 MB 730 MB
Usable Data Bytes
DC POWER REQUIREMENTS
The following voltage specifications apply at the file power connector. Damage to the file
electronics may result if the power supply cable is connected or disconnected while power is
being applied to the file (no hot plug/unplug is allowed). There are inductive loads in the file
which could cause destructive high voltage spikes on the file if the power connection is
opened. There is no special power on/off sequencing required.
Nominal Supply
Voltages +5 Volts +12 Volts
Maximum Ripple
(0-20MHz) 100 mV p-p 100 mV p-p
Voltage Supply Tolerance
(incl ripple) +/- 5% +10%/-8%
Power Supply Current
(Amps) +5 Volts +12 Volts
Start Peak 0.55 1.10
Idle Average 0.21 0.14
R/W Average 0.44 0.20
Seek Average 0.38 0.29
During the file start up and seeking, 12-volt ripple is generated by the file (referred to as
dynamic loading). If several files have their power daisy chained together then the power
supply ripple plus other file's dynamic loading must remain within the regulation tolerance of
+10/-8%. A common supply with separate power leads to each file is a more desirable
method of power distribution.
To prevent external electrical noise from interfering with the file's performance, the file must
be held by four screws in a user system frame which has no electrical level deference at the
four screws position, and has less than +/-300 millivolts peak to peak level deference to the
file power connector ground.
SIGNAL DEFINITION
The pin assignments of interface signals are listed as follows:
PIN Signal Name PIN Signal Name
01 Ground 02 -DB(0)
03 Ground 04 -DB(1)
05 Ground 06 -DB(2)
07 Ground 08 -DB(3)
09 Ground 10 -DB(4)
11 Ground 12 -DB(5)
13 Ground 14 -DB(6)
15 Ground 16 -DB(7)
17 Ground 18 -DB(P)
19 Ground 20 Ground
21 Ground 22 Ground
23 Ground 24 Ground
25 Open 26 TRM Power
29 Ground 30 Ground
31 Ground 32 -ATN
33 Ground 34 Ground
35 Ground 36 -BSY
37 Ground 38 -ACK
39 Ground 40 -RST
41 Ground 42 -MSG
43 Ground 44 -SEL
45 Ground 46 -C/D
47 Ground 48 -REQ
49 Ground 50 -I/O
SCSI CABLE
The disk drive uses single-ended drivers and receivers which will permit cable lengths of up
to 6 meters (19.68 feet). For a single ended cable a 50 conductor flat cable or a 25 signal
twisted cable can be used with a maximum length of 6.0 meters, and a stub length not
exceeding 0.1 meters.
SCSI BUS TERMINATOR
The file has an internal Active SCSI bus terminator, and can be controlled on/off with one
jumper block provided at the card edge. The user is responsible for properly terminating and
empowering the SCSI bus in the using system.
MODE SELECT OPTIONS
Certain parameters are alterable using the SCSI "Mode Select" command. This allows certain
drive characteristics to be modified to optimize performance on a particular system. Refer to
the DSAS-3XXX Interface Specification for a detailed definition of Mode Select parameters.
The changeable parameters are:
Page 0
Vendor Unique Parameters
DPC - Disable Parity Checking (0)
Page 1
Read-Write Error Recovery Parameters
TB - Transfer Block (0)
PER - Post Error (O)
DTE - Disable Transfer on Error (0)
DCR - Disable Correction (0)
Read Retry Count (01h)
Write Retry Count (01h)
Page 2
Disconnect/Reconnect Parameters
Read Buffer Full Ratio (0C0h)
Write Buffer Empty Ratio (0C0h)
Page 7
Verify Error Recovery Parameters
PER (0)
DCR (0)
Verify Retry Count (01h)
Page 8
Caching Parameters
WCE - Write Cache Enable (1)
RCD - Read Cache Disable (0)
Number of Cache Segments
Page A
Control Mode Page Parameters
Queue Algorithm Modifier (0)
QErr - Queue Error (01h)
DQue - Disable Queuing (0)
Page OD
Power Condition
Standby (1)
Standby Timer (1A5EOh [3 hrs])
MECHANICAL DATA
Dimensions
Height 25.4 +/-0.4mm
Width 101.6 +/-0.4mm
Depth 146.0 +/-0.6mm
Weight 530 g maximum
Mounting Orientation
The Drive can be mounted in any axis (6 directions).
146
+/-
0.6
.4
/- 0
The maximum allowable
.6 +
penetration of the mounting
101
screws is 1 3.5 mm 2 6 mm.
ELECTROMAGNETIC
COMPATABILITY
60
The Drive meets the following
41.6
EMC requiements when
installed in the user system and
(6x) UNC 6-32
exercised with a random
accessing routine at maximum data rate:
(4X) UNC 6-32 2
Back Front
60.3 44.4
United States Federal Communication Commission (FCC) Rules and Regulations Part 15,
Subject J -Computer Devices "Class B Limits".
Eurpoean Economic Community (EEC) directive #76/889 related to the control of radio
frequency interference and the Verband Deutscher Elektrotechniker (VDE) requirements of
Germany (GOP).
AMP is a trademark of
AMP Incorporated.
Molex is a trade mark of
Molex Incorporated.
DATA MATE is a trade mark of
AMP Incorporated.
This data sheet is not a substitute for the full product specification, which should be used
when detailed information is required.
Product Description data represents IBM's design objectives and is provided for comparative
purposes; actual results may vary based 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 OEM representative. Data subject to change
without notice.
PACKAGING: The drive must be protected against Electro-Static Discharge especially when
being handled. The safest way to avoid damage is to put the drive in an anti-static bag before
ESD wrist straps, etc are removed.Drives should only be skipped in approved containers,
severe damage can be caused to the drive if the packaging does not adequately protect against
the shock levels induced when a box is dropped. Consult your IBM marketing representative
if you do not have an approved shipping container.