7 4 2 0 A V MAXTOR
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/SLIMLINE Cylinders | | |
Capacity form/unform 422/ MB Heads 3| | |
Seek time / track 14.0/ 3.0 ms Sector/track | | |
Controller IDE / ATA2 FAST/ENHA Precompensation
Cache/Buffer 32 KB SEGMENTED Landing Zone
Data transfer rate 3.500 MB/S int Bytes/Sector 512
11.100 MB/S ext PIO3
Recording method RLL 1/7 operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 55 | -40 71
Power: sleep 0.4 W Humidity % 5 95 | 5 95
standby 0.5 W Altitude km -0.061 3.048|
idle 3.8 W Shock g 35 | 120
seek 4.3 W Rotation RPM 3551
read/write 4.1 W Acoustic dBA
spin-up 10.3 W ECC Bit ON THE FLY,REED SOLOMON
MTBF h 300000
Warranty Month 24
Lift/Lock/Park YES Certificates CSA,FCC,TUV,UL478,VDE
**********************************************************************
L A Y O U T
**********************************************************************
MAXTOR 7540AV/7420AV/7270AV PRODUCT MANUAL 1272 P6; 1994
+---------------------------------------------------------+
| J20-+-+-+-+-+-J25 |
| +-+-+-+-+-+-+ |
| |
| XX
| XX
| XX
| XX J1
| X*
| XX
| XX
| XX
| XX
| XX1-2
| | 1
| XX Power
| XX J2
+---------------------------------------------------------+
**********************************************************************
J U M P E R S
**********************************************************************
MAXTOR 7540AV/7420AV/7270AV PRODUCT MANUAL 1272 P6, 08/09/94
Jumper setting
==============
Note: Jumpers J21 and J25 are factory reserved.
A spare shunt is shipped between J23 and J24.
J20 Master/Slave
-----------------
J20 CLOSED Only drive in single drive system (Default)
J20 CLOSED Master in dual drive system
J20 OPEN Slave in dual drive system
J22 Default Parameters (7540AV only)
------------------------------------
J22 OPEN 1046 x 16 x 63 (default)
CLOSED 1024 x 16 x 63
J23 Write Cache
----------------
J23 OPEN Enabled (default)
J23 CLOSED Disabled
J24 Cable Select
-----------------
J24 OPEN Disabled (default)
J24 CLOSED Enabled
**********************************************************************
I N S T A L L
**********************************************************************
MAXTOR 7540AV/7420AV/7270AV PRODUCT MANUAL 1272 P6, 08/09/94
Notes of Installation
=====================
Installation direction
----------------------
horizontally vertically
+-----------------+ +--+ +--+
| | | +-----+ +-----+ |
| | | | | | | |
+-+-----------------+-+ | | | | | |
+---------------------+ | | | | | |
| | | | | |
| | | | | |
+---------------------+ | +-----+ +-----+ |
+-+-----------------+-+ +--+ +--+
| |
| |
+-----------------+
The drive will operate in all axis (6 directions).
Recommended Mounting Configuration
----------------------------------
Maxtor 7000 Series drive design allows greater shock tolerance than
that afforded by larger, heavier drives. The drive may be mounted in
any attitude using four size 6-32 screws with 1/8" maximum
penetration.
Allow adequate ventilation to the drive to ensure reliable drive
operation.
Air Filtration System
---------------------
All 7000 Series drives are designed to operate in a typical
office environment with minimal environmental control. Over the life
of the drive, a 0.3 micron filter and breather filter (located within
the HDA) maintain a clean environment to the heads and disks.
Read/Write Electronics
----------------------
An integrated circuit mounted within the sealed enclosure (near the
read/write heads) provides one of four head selection (depending on
the model), read preamplification, and write drive circuitry.
Read/Write Heads and Disks
--------------------------
Four low mass, low force read/write heads record data on two 3.5"
diameter disks. Maxtor uses a sputtered thin film medium on all
disks for 7000 Series drives.
Drive Meachanism
----------------
A brushless DC direct-drive motor rotates the spindle at 3,551 RPM
( 0.1%). The dynamically balanced motor/spindle assembly ensures
minimal mechanical runout to the disks. A dynamic brake provides a
fast stop to the spindle motor upon power removal. The speed
tolerance includes motor performance and motor circuit tolerances.
Voice Coil Actuator
-------------------
All 7000 Series drives employ a rotary voice coil actuator which
consists of a moving coil, an E-block or actuator arm assembly, and
stationary magnets. The actuator moves on a low-mass, low-friction
center shaft. The low friction generated contributes to fast average
access time and low power consumption.
Automatic Headpark and Lock Operation
-------------------------------------
Immediately following power-down, dynamic braking of the spinning
disks delays momentarily and lets the heads move to an inner
mechanical stop. A small fixed magnet holds the heads in place as the
disk spin down. The heads are released only when power is again
applied.
Dual Drive Support
------------------
Two drives may be accessed via a common interface cable, using the
same range of I/O addresses. The drives are jumpered as drive 0 or 1,
and are selected by the drive select bit in the Drive/Head register
of the task file.
All Task File registers are written in parallel to both drives. The
interface processor on each drive decides whether a command written
to it should be executed; this depends on the type of command and
which drive is selected. Only the drive selected executes the command
and activates the data bus in response to host I/O reads; the drive
not selected remains inactive.
A master/slave relationship exists between the two drives: drive 0 is
the master, and drive 1, the slave. When J20 is closed (factory
default), the drive assumes the role of master; when open, the drive
acts as a slave. In single drive configurations, J20 must be closed.
Cable Select
------------
CSEL (cable select) is an optional feature per ATA CAM specification.
Drives configured in a multiple drive system are identified by CSEL's
value:
- If CSEL is grounded, then the drive address is 0.
- If CSEL is open, then the drive address is 1.
NOTE
If the Cable Select jumper (J24) is installed, the Master/Slave
jumper (J20) will be ignored.
Sector Address Translation
--------------------------
All 7000 Series drives feature a Universal Translate Mode. In an
AT-class system, the drive may be configured to any specified
combination of cylinders, heads, and sectors (within the range of the
drive's formatted capacity).
These drives powers-up in the Translate Mode:
Model Cylinders Heads Sectors
7540AV 1024 16 63
7270AV 959 11 50
Interface Connector
-------------------
All 7000 Series AT drives have a 40-pin interface connector mounted
on the PCBA. The drive may connect directly to the host; or it can
also accommodate a cable connection (maximum cable length: 18
inches).
(Striped Edge = Pin 1)
Buffer Segmentation
-------------------
The data buffer is organized into three segments: the read buffer,
the write buffer, and an micro controller scratch pad. The read
segment occupies half of the buffer and operates as a circular read-
ahead buffer. The write segment occupies the other half. During write
operations, it contains the host write data. Commands ATA Read Buffer
(E4) and ATA Write Buffer (E8) are implemented per CAM specification
4a.
Read-Ahead Mode
---------------
Normally, this mode is active. Following a read request, disk read-
ahead begins on the first sector and continues sequentially until the
buffer is full. If a read request is received during the read-ahead
operation, the buffer is examined to determine if the request is in
the cache. If a cache hit occurs, read-ahead mode continues without
interruption and the host transfer begins immediately.
**********************************************************************
F E A T U R E S
**********************************************************************
MAXTOR 7540AV/7420AV/7270AV PRODUCT MANUAL 1272 P6 08/09/94
Introduction
------------
Maxtor 7000 Series AT disk drives are 1" high, 3.5" random access
storage devices which incorporate an on-board AT controller. Maxtor
engineers have applied recent advances in hard drive technology to
the design and manufacture of these drives. High data transfer rates
and fast access times make them especially well-suited to desktop and
workstation applications.
Defect Management Zone (DMZ)
----------------------------
Each drive model has a fixed number of spare sectors per DMZ; 7540AV
= 8, 7420AV = 6, 7270AV = 4, all of which are located at the end of
each DMZ. Upon detection of a bad sector that has been reassigned,
the next sequential sector is used.
The first spare sector makes up for the loss of sector 3, and so
maintains the sequential order of data, with 2 spare sectors still
allocated for that cylinder. This push down method assures maximum
performance.
In the rare occurrence that the number of reassigned bad sectors
exceed the number of spare sectors allocated for that cylinder, an
alternate track at the inner diameter of the disk is used. The 7546A
has four (4) alternate tracks.
Error Correction Code
---------------------
All models use a Reed-Solomon code for error detection and
correction. The error correction polynomial can correct one error
burst with a maximum of 22 bits or two bursts with a maximum of 11
bits each. Individual bursts ( 11 bits) are corrected through
on-the-fly correction hardware without any performance degradation.
Zone Density Recording
----------------------
The disk capacity is increased with bit density management - common
with Zone Density Recording. Each disk surface is divided into 8
circumferential zones. All tracks within a given zone contain a
constant number of data sectors. The number of data sectors per track
varies in different zones; the outermost zone contains the largest
number of data sectors, and the innermost contains the fewest.
Seek Time
---------
+----------------------------------+--------+
|Track-to-Track msec. typ. | 3 |
+----------------------------------+--------+
|Average msec. typ. | 14 |
| msec. max. | 31 |
+----------------------------------+--------+
|Controller overhead msec. | 0.7 |
+----------------------------------+--------+
|Latency msec. avg. | 8.45 |
+----------------------------------+--------+
Execute Drive Diagnostics
-------------------------
Commands the drive to implements the internal diagnostics tests.
(These tests are executed only upon command receipt; they do not run
automatically at power up or after a reset.)
The drive sets BSY immediately upon receiving this command.
This table presents the codes and their descriptions:
Note that the value in the Error register should be viewed as a
unique 8 bit Code.
+-----------+----------------------------------+
|Error Code | Description |
+-----------+----------------------------------+
| 01 | no error detected |
+-----------+----------------------------------+
| 02 | formatter device error |
+-----------+----------------------------------+
| 03 | sector buffer error |
+-----------+----------------------------------+
| 04 | ECC circuitry error |
+-----------+----------------------------------+
| 05 | controller microprocessor error |
+-----------+----------------------------------+
| 8x | slave drive failed (Note) |
+-----------+----------------------------------+
Note: If a slave drive fails diagnostics, the master
drive OR's 80 hex with its own status, and loads that
code into the Error register.
If a slave drive passes diagnostics (or a slave is
absent), the master drive OR's 00 with its own status
and loads that code into the Error register.
EISA Type "B" and Type "F" DMA Modes
------------------------------------
Direct Memory Access (DMA) transfers improves system performance by
significantly improving troughtput.
Physical Configuration Sectors per track
----------------------------------------
Zone 1 = 123 Zone 2 = 120 Zone 3 = 112
Zone 4 = 104 Zone 5 = 96 Zone 6 = 87
Zone 7 = 80 Zone 8 = 72
Data transfer rate (MBytes per second)
--------------------------------------
Zone 1 = 4.75 Zone 5 = 3.57
Zone 2 = 4.58 Zone 6 = 3.33
Zone 3 = 4.25 Zone 7 = 3.03
Zone 4 = 3.95 Zone 8 = 2.70
Logical Block Addressing
------------------------
The Logical Block Address (LBA) mode can only be utilized into
systems that support this form of translation. The cylinder, head and
sector geometry of the drive, as presented to the host, differs from
actual physical geometry.
The host AT computer may access a drive of set parameters: number of
cylinders, heads, and sectors per track, plus cylinder, head and
sector addresses. However, the drive can't use these host parameters
directly because of zoned recording techniques. The drive translates
the host parameters to a set of logical internal addresses for data
access.
The host drive geometry parameters are mapped into an LBA based on
this formula:
LBA = (HSCA-1)+HHDAxHSPT+HNHDxHSPTxHCYA (1)
= (HSCA-1)+HSPTx(HHDA+HNHDxHCYA) (2)
where HSCA = Host Sector Address, HHDA = Host Head Address
HCYA = Host Cylinder Address, HNHD = Host Number of Heads
HSPT = Host Sectors per Track
The LBA is checked for violating the drive capacity. If it does not,
the LBA is converted to physical drive cylinder, head and sector
values. The physical address is then used to access the data stored
on the disk and other drive related operations.