I would not recommend placing them on the same channel, but physically it should not do any harm, other than potentially slowing the faster drive. 7200rpm is how fast the disc spins, this is the standard over the old standard of 5400rpm. the 100 and 133 related to the bus speed of the drive, eg, how much data they can transfer in a single buffer request, thus 133 is faster, 33% faster to be exact. These numbers are similar to the way RAM works, the have elevated from 100, 133, 233, 333, 433, etc, the more data that can be read or written in a single pass, the faster the entire file can be dealt with.
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