Activity pin to complete the circuit. Note: The Ultrastar has two sets of pins, one on the front and one
on the back, which are connected to the same LED driver circuit. The combined current capability is
stated above.
Write Protect - pins 19 & 20
When the Write Protect pin is jumpered, SCSI commands that alter the customer data area portion of
the media will not be performed. The state of this pin is monitored on a per command basis.
Disable Target Initiated Synchronous Negotiation - pins 25 & 26
When the Disable Target Initiated Synchronous Negotiation pin is jumpered, an Initiator is required to
start a negotiation handshake if Synchronous and/or Wide (double byte) SCSI transfers are desired.
Disable SCSI Parity - pins 27 & 28
Jumpering these pins disables SCSI Parity Checking.
Disable Unit Attention - pins 29 & 30
Jumpering these pins disables the drive from building Unit Attention Sense information for commands
immediately following a Power On Reset (POR) or SCSI Bus Reset. Any pending Unit Attention
conditions will also be cleared at POR or SCSI Reset times.
Disable Wide Negotiations - pins 31 & 32
Jumpering these pins causes the drive to operate in a single byte mode. The drive will not negotiate
for wide (double byte) operation.
Force Single-Ended Mode - pins 23 & 24
Jumpering these pins on LVD models causes all models to operate in Single-Ended mode only.
80 pin models - option jumper block
Ground
+5V
Blank
Ground
External Activity LED
Write Protect
Auto Start Delay
Disable Sync Negotiations
Disable SCSI Parity
Disable Unit Attention
Auto Start Disable
Force Single-ended Mode
SCSI Address
Reserved
Disable Wide Negotiations
Reserved
Ground
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
3 2 1 0
| | | |
1 3 5 7
11 13 15 17 19 21 23 25 27 29 31
80 pin SCA-2 front option jumper block
IBM storage products
Page 8
IBM Hard Disk Drive Technical Support Center version 2.0
34L3743IG10
