Hi All This has got me scratching my head so any thoughts would be useful.   I'm upgrading an ASUS mobo from 5.2 to 6.1 that has 6 on board sata (5 internal and 1 esata) plus a Supermicro (Marvell) 8 port sas/sata controller. In 5.2 the onboard were set to IDE (and only 4 channels enabled) and with the Marvell I had 12 drives - all good.   With 6.1 I've swapped on board to AHCI mode, the 6 sata appear as drives 1-6 in DSM - all ok for the test.   Then the