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46 Appendix Server Diagnostics Test Reference
Hard Drive Tests
When Server Diagnostics Mac OS X starts, it performs a hardware existence test.
Hard drives and solid-state drives found during this test can be tested individually
using hard drive tests.
Test Estimated completion time Description
Threaded Surface Scan 3 hours for a 1 TB drive Scans the entire surface of
a hard drive.
This test is available for hard
drives, but not solid-state drives.
Threaded Surface Short Scan 2 minutes Scans the rst 10 GB of a hard
drive.
This test is available for hard
drives, but not solid-state drives.
Check SMART Status 1 second Checks the SMART status of
a hard drive.
This test is available for hard
drives, but not solid-state drives.
Short Random Multi-block 5 minutes Performs a threaded, random
multi-block read of random
ranges of the target hard drive.
This isn’t a full surface scan,
but it causes rapid seeking and
reading of hard drive blocks. If
a block can’t be read, an error
occurs.
This test is available for hard
drives, but not solid-state drives.
SSD Threaded Media Scan Not available Scan’s the entire accessible area
of a solid-state drive.
This test is available for solid-
state drives, but not hard drives.
SSD New Drive SMART Data Not available Checks the SMART status of a
solid-state drive.
This test is available for solid-
state drives, but not hard drives.