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Memory diagnostic software programs (e.g., [[memtest86]]) are low-cost or free tools used to check for memory failures on a PC. They are usually in the form of a bootable software distribution on a [[floppy disk]] or [[CD-ROM]]. The diagnostic tools provide memory test patterns which are able to test all system memory in a computer. Diagnostic software cannot be used when a PC is unable to [[boot-up|start]] due to memory or [[motherboard]]. While in principle a test program could report its results by sending them to a storage device (e.g., floppy disc) or printer if working, or by sound signals, in practice a working display is required.
==== {{anchor|Worm test}}
Some stronger memory tests capable of detecting subtle timing problems are implemented as [[self-modifying code|self-modifying]], [[self-relocating]] and potentially self-destructive memory [[helpful worm|worm]]s called ''
== Detected faults ==
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