Crucial, best known for their memory products, was the first to put an SSD on the market with a 6Gbps interface way back in early 2010 with the C300 drive. Back then, we ran some tests and found it to be impressive when compared to what was on the market at the time with its 355 MB/s reads and 215 MB/s writes. Since then, a lot has changed and there are a number of 6Gbps drives on the market now so competition is definitely stiffer this time around. For clarification, the naming of the drive can be a little confusing between Crucial and Micron. Crucial drives will carry the moniker of m4 while the Micron model name is C400. Both are the same drive with different branding and successor to what most people know as the C300 drive we referenced above. For the purposes of the article and simplicity's sake, we'll refer to the drive as the Crucial m4.