I´m a little bit confused of Plextor M5-series
Have a M5S 256GB FW1.03 in my Intel-Laptop with XP and Crystaldiskinfo only shows NAND-write. In a PC from a friednd with AMD 970-chipset and MS-AHCI his M5S 128GB 1.03 it shows Host Read/Write and NAND-write
What CDI shows on your Plextors?
Benq DW 1640, LG GH-20N, Pioneer BDR-208
Crucial M4, Sandisk SSD, Plextor M5S, Sandisk Ultra Plus, OCZ Petrol 256GB