Question on SAT re: translation of STANDBY

Mark Overby MOverby at
Fri Jan 30 09:12:50 PST 2009

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Issuing STANDBY IMMEDIATE forces the timer to be disable until you return to
the active state. (It has an equivalent behavior of the timer going to zero
immediately) (I'm excluding the unload feature of the standby immediate for
simplicity). So I believe it accomplishes what was expected.
Also, when that translation was first created - no timers were supported.
On 1/29/09 11:36 PM, "Bill.Martin at Emulex.Com" <Bill.Martin at Emulex.Com> wrote:
SAT2r6 states in table 45 that if the power condition is 03 - standby then
"If the ATA flush command was sent (step 2) and completes
without error, then the SATL shall send an ATA STANDBY IMMEDIATE command to
the ATA device;"
However, SBCr17 states that if a START STOP UNIT command is processed with
the POWER CONDITION field set to ACTIVE, IDLE, or STANDBY, then:
a) the logical unit shall transition to the specified power condition; and
b) the device server shall disable the idle condition timer if it is active
(see SPC-4) and disable the standby condition timer if it is active (see
SPC-4) until another START STOP UNIT command is processed that returns
control of the power condition to the logical unit, or a logical unit reset
This requires disabling the standby condition timer. This would require
setting the count field to zero in the STANDBY command sent to the ATA
Was there a reason for not setting the count field to zero, or was this an
oversight?  I did not find any comment addressing this in the letter ballot
Bill Martin
Office of Technology
Industry Standards
916 772-3658
916 765-6875 (Cell)
bill.martin at
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