Memory (Simple) Tests
Simple memory tests test the first 2.5 GB of memory. To test all memory, run extended
memory tests.
Even though simple memory tests don’t test all memory, run these tests to detect
intermittent memory issues.
In AXD EFI tools, all memory tests (simple, multicore, and extended) are grouped under
Memory tests.
Note: The time required to complete memory tests correlates to the size of memory
being tested. These estimates are based on testing 1 GB of memory.
Test
Estimated completion time
Description
Full Read
30 minutes for an 80 GB
drive; 4 hours for a 750 GB
drive
Performs a DMA full-read scan at 1250
RPM. This checks the entire hard drive
for slow-read failures.
Test
Estimated completion time
Description
Address as Data
5 seconds
Tests memory using the memory
address as data
Patterns
25 seconds
Tests memory using different data
patterns
Marching Ones and Zeros
15 seconds
Tests memory by walking 1s and 0s
up and down memory
Knaizuk Hartmann
10 seconds
Tests memory using this algorithm
MOD3
30 seconds
Tests memory using this algorithm
Van de Goor’s March U
2 minutes
Tests memory using this algorithm
Random Values
15 seconds
Uses pseudo-random values
Block Checkerboard 32
10 seconds
Alternates 32-bit words with all 1s and
all 0s, and then with all 0s and all 1s
Bit Checkerboard 32
10 seconds
Alternates bits with all 1s and all 0s,
and then with all 0s and all 1s
Sequential Byte Block 32
14 minutes
Fills all bytes sequentially with
patterns starting at 0x00 and ending
at 0xFF
Walking One 32
5 minutes
Walks 1s up and down memory
Walking Zero 32
5 minutes
Walks 0s up and down memory
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Appendix
AXD Tools Test Reference