Hard Drive Tests
When Server Diagnostics Mac OS X starts, it performs a hardware existence test. All
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
2 hours for an 500 GB drive;
3 hours for a 1 TB drive
Scans the entire surface of a
hard drive.
Threaded Surface Short Scan
3 minutes
Scans the first 10 GB of a hard
drive.
Check SMART Status
1 second
Checks the SMART status of a
hard drive.
Short Random Multi-block
7 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.