http://www.memorytesters.com/
there are a variety of mem testers on the market.
for cd/dvd drives, check the hour usage and then run a cd/dvd diagnostics program. i don't remember which program we used to use for testing drives. if you are dealing with older drives you will need to check operating system support for correct drivers. we no longer sell used drives. a new drive is under $30. why mess around with a used one?
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