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Go back. Start over. First look at your symptoms which say nothing about a memory problem.
A disk drive consists of two parts: a computer and a disk platter. CRC error occurs when the disk drive computer reads data off the platter erroneously.
Do not try to fix anything - ie run a defrag. Diagnostics mean breaking a problem down into parts. Long before that other part - fixing something - first identify the problem.
Now, how does this external drive get connected - USB? Some USB ports do not provide sufficient power or a marginal voltage when a largest load is applied. USB ports are limited to ten watts. Disk drives consume something less than ten watts. Was the drive designed with a ten percent margin or error? Well, first confirm the problem stays with the drive on numerous USB ports of other systems.
A responsible disk drive manufacturer will provide comprehensive hardware diagnostics. That is a tool to discover if the drive is reliable on one USB port and not on another.
Typically a CRC error is either a defective disk platter or a problem with the read write heads and electronics. However, a low USB voltage can make numerous and contradictory errors. Worse, trying to fix this during low voltage could eventually trash the entire drive.
Diagnostics are step one: how to first identify the problem long before fixing anything. Trying to fix something without doing step one can even make the problem exponentially more complex.
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