Sorry, if this should be in the hardware forum... I am doing a fresh (bare metal) install. I am experiencing a weird problem with Win7 not remembering drive letter. I am hoping that someone has run across this problem and has the answer. I tried "Diskpart automount enable". It did not work... My config: ASRock Z77 Extreme6 - BIOS v2.40 latest, Intel i5-3570k (not overclocking), 32GB G.SKill Ares Series. Windows 7 Ultimate SP1. I am doing a Win7 Ultimate SP1 bare metal install. I use two Seagate ST3500320AS (500GB) drives in RAID-1 (Mirror) mode. I partition the mirror into two simple primary partitions and assigned drive letters. Win7 has no problem remembering the drive letters. I need more space so I replaced the 500BG with two Seagate ST31000528AS (1TB) drives in RAID-1 (Mirror) mode. Win7 sees the mirror. I partitioned and assigned drive letters. After a reboot, Win7 would not reassign drive letter to the partitions. I reinstalled Win7 - same problem. I deleted RAID-1 and connect one drive at a time - same problem. I defined one partition to the entire drive - same problem. I tried without Win7 updates and with Win7 updates - same problem. I put the Seagate ST3500320AS (500GB) drives back in - no problem. Win7 reassigned the drive letters to the 50GB drives. I removed the drive letters and assigned them to the 1TB drive. Rebooted same problem. The only difference in the configuration is the hard drives.