amv2mt is a codec by the way, what it does is shrinks the recording down enough that it won't cause problems when it reaches the HDD.
It also has quality control settings, so you can make the file smaller/bigger.
But even with this you either need an HDD fast enough to get all the data, or you can just cut to the chase and get an SSD.
SSD is incredibly fast, and should be pretty much guaranteed to get the data with no issues.
Once it goes on there, just copy the files somewhere else.
When Spazbo feels like it he might post a tutorial or something (Unless he already did).