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PRODUCT DESCRIPTION
Subsystem Configuration
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 device 0 or 1 (Master/Slave), and are selected by the drive select bit in the
Device/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: device 0 is the master and device 1 the slave.
When J50 is closed (factory default, figure 2-1), the drive assumes the role of master; when open, the drive
acts as a slave. In single drive configurations, J50 must be closed.
Cable Select Option
CSEL (cable select) is an optional feature per ANSI ATA 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.
Jumper Location/Configuration
Darkened jumper pins indicate factory-installed (default) shunts.
4092 Cylinder Limitation
On some older BIOS', primarily those that auto-configure the disk drive, a hang may occur when the drive
cylinder value exceeds 4096. The 4092 Cylinder Limitation jumper reduces the capacity in the Identify Drive to
4092 – allowing large capacity drives to work with older BIOS'. Use Maxtor's MaxBlast Plus installation software
to access the full capacity of the drive.
2 – 6
Figure 2-1
PCBA Jumper Location and Configuration
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- Jumper Location/Configuration
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