40 Appendix Server Diagnostics Test Reference
Hard Drive Tests

When Server Diagnostics EFI starts, it performs a hardware existence test. Hard drives

found during this test can be tested individually using hard drive tests.

Test Estimated completion time Description
Full Read 3 hours for a 1 TB drive Performs a DMA full-read scan
at 1250 RPM. This checks the
entire hard drive for slow-read
failures.
This test is available for hard
drives, but not solid-state drives.
Abbreviated Read 2 minutes Performs a DMA scan at 1250
RPM. This checks the rst 10 GB
of the hard drive for slow-read
failures.
This test is available for hard
drives, but not solid-state drives.
Check SMART Status 1 second Check the SMART status of
a hard drive.
This test is available for hard
drives, but not solid-state drives.
Memory Tests

Simple Memory Tests

In Server Diagnostics EFI, memory tests (simple, multicore, and extended) are grouped

under Memory tests.

Note: The time required to complete memory tests correlates to the amount of

memory being tested. These estimates are based on testing 8 GB of memory.

Test Estimated completion time Description
Address as Data 15 seconds Tests memory using the
memory address as data.
Patterns 40 seconds Tests memory using dierent
data patterns.
Marching Ones and Zeros 30 seconds Tests memory by walking 1s and
0s up and down memory.
Knaizuk Hartmann 20 seconds Tests memory using this
algorithm.
MOD3 1 minute Tests memory using this
algorithm.
March U 3 minutes Tests memory using Van de
Goor’s March U algorithm.