Anyone have recommendations on an ISO Image burning software that works better than others for updating the firmware? I've used a few in the past, and if my memory serves me right it seems like I had issues with some. I think this was when I was trying to create a Linux image CD.
If the device manufacturer says to format the drive, I would just follow their instructions. You won't wear out the drive much by doing so, and if you are using it as a boot drive, you won't ever be writing to most of the NAND more than a few times (a few write cycles).
Also note that the drive being tested is 256GB, not the 128GB that the OP has; so his AS-SSD scores will be even lower.
Most SSD manufacturers advertise best-case scenario specs to entice users to buy their drives.
Neither ATTO, AS-SSD or CDM are "Real World" benchmarks since their data sets are at the opposite ends of the data compression spectrum. Nobody uses exclusively 100% compressible data or exclusively 0% compressible data.
What you say is not true. Yes you won't see those speeds on an M4 with AS-SSD, you will see better. And you are even misquoting Aandtech. The link you pointed to shows 410 MB/s read and 272 MB/s AS-SSD write speeds for the 256 GB Crucial M4
Many people have published their AS-SSD benchmarks for the M4 and see better than those speeds. In fact, with 009 of their firmware, they are seeing write speeds in excess of 500 MB/s read and 269 MB/s write on the 256GB M4: