Geoff,

What about an offline versus the long test? The ATA specification is very vague on this point. I'm curious to know know if the offline is generally the most comprehensive, exceeding the long test.

My laptop drive supports the offline test but I get an error when issuing the command to start the offline test. Selective is also is accepted but never started, failing when the command is issued (Captive mode or not). I assume the drive was reporting false capabilities rather than the OS being a factor as well.

Trevor

$ sudo smartctl -t offline  /dev/disk0

smartctl 5.39.1 2010-01-28 r3054 [i386-apple-darwin9.6.2] (local build)

Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF OFFLINE IMMEDIATE AND SELF-TEST SECTION ===
Sending command: "Execute SMART off-line routine immediately in off-line mode".
Command "Execute SMART off-line routine immediately in off-line mode" failed: Invalid argument



$ sudo smartctl -t select,3552394-3752394 /dev/disk0

smartctl 5.39.1 2010-01-28 r3054 [i386-apple-darwin9.6.2] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF OFFLINE IMMEDIATE AND SELF-TEST SECTION ===
Sending command: "Execute SMART Selective self-test routine immediately in off-line mode".
SPAN         STARTING_LBA           ENDING_LBA
   0              3552394              3752394
Command "Execute SMART Selective self-test routine immediately in off-line mode" failed: Invalid argument



$ sudo smartctl -c /dev/disk0

smartctl 5.39.1 2010-01-28 r3054 [i386-apple-darwin9.6.2] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF READ SMART DATA SECTION ===
General SMART Values:
Offline data collection status:  (0x00)    Offline data collection activity
                    was never started.
                    Auto Offline Data Collection: Disabled.
Self-test execution status:      (  32)    The self-test routine was interrupted
                    by the host with a hard or soft reset.
Total time to complete Offline
data collection:          (1298) seconds.
Offline data collection
capabilities:              (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    Conveyance Self-test supported.
                    Selective Self-test supported.
SMART capabilities:            (0x0003)    Saves SMART data before entering
                    power-saving mode.
                    Supports SMART auto save timer.
Error logging capability:        (0x01)    Error logging supported.
                    General Purpose Logging supported.
Short self-test routine
recommended polling time:      (   2) minutes.
Extended self-test routine
recommended polling time:      ( 184) minutes.
Conveyance self-test routine
recommended polling time:      (   2) minutes.
SCT capabilities:            (0x003d)    SCT Status supported.
                    SCT Feature Control supported.
                    SCT Data Table supported.






On Sat, Jul 24, 2010 at 10:04 AM, <cfrees@imapmail.org> wrote:
On Fri 23rd Jul, 2010 at 19:11, Geoff Keating seems to have written:

>
> On 23/07/2010, at 1:35 PM, Dr. Clea F. Rees wrote:
>
>> I just installed a new hard disk and tried to run the supported tests
>> on it. The drive is not in the database, but reports that it is able to
>> do offline testing (which isn't compatible with my OS), short/long
>> self-tests (run fine) and a conveyance test. If I try to run the
>> latter, the command initially appears to be OK but a moment later, I
>> get a complaint about an invalid argument. I'm wondering if this is
>> something I should be worried about.
>
> You can't run conveyance tests on Darwin either, the OS doesn't support it.  If you have already run a long test that should include everything the conveyance test would check.
>
Thanks very much.

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