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USER RESPONSIBLE FOR VERIFYING VERSION AND COMPLETENESS
OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" HIGH
Note: A timeout of one minute or more is recommended but NOT required. The larger system timeout
limit allows the system to take advantage of the extensive ERP/DRP that the drive may attempt in order to
successfully complete the start-up sequence.
Note: A 60 second minimum is required if electronics card replacement is required as a service practice.
Please contact an IBM Customer Representative for more details if required.
Medium Access Command Time:
The timeout limit for medium access commands that transfer user data
and/or non-user data should be a minimum of 30 seconds. These commands are:
Log Select
Log Sense
Mode Select
Mode Sense
Pre-Fetch
Read
Read Capacity
Read Defect Data
Read Long
Receive Diagnostic Results
Release
Reserve
Rezero Unit
Seek
Send Diagnostic
Verify
Write
Write and Verify
Write Buffer
Write Long
Write Same
Note: The 30 sec limit assumes the absence of SSA link contention and user data transfers of 64 blocks or
less. This time should be adjusted for anticipated SSA link contention and if longer user data transfers are
requested.
Timeout limits for other commands:
The drive should be allowed a minimum of 5 seconds to complete
these commands:
Format Unit (with Immed bit = 1)
Inquiry
Read Buffer
Read Memory
Request Sense
Start/Stop Unit (with Immed bit = 1)
Synchronize Cache
Test Unit Ready
When Automatic Reallocation is enabled add 45 seconds to the timeout of the following commands: Read
(6), Read (10), Write (6), Write (10), Write and Verify, and Write Same.
The command timeout for a command that is not located at the head of the command queue should be
increased by the sum of command timeouts for all of the commands that are performed before it is.
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