I tried both 3GB and it did not work so I tried 6GB and still not working.
Here some more error before the mounting. I checked out the log on Vbox and it reported LUN#0 disk write error.
Have you see that before?
:00:03.747172 VMMDev: Guest Log: BIOS: Boot : bseqnr=1, bootseq=0002
00:00:03.747592 VMMDev: Guest Log: BIOS: Booting from Hard Disk...
00:00:06.728910 VMMDev: Guest Log: BIOS: int13_diskette_function: unsupported AH=41
00:00:22.366597 PIT: mode=2 count=0x2e9c (11932) - 99.99 Hz (ch=0)
00:00:24.216578 PIIX3 ATA: Ctl#0: RESET, DevSel=0 AIOIf=0 CmdIf0=0xc4 (-1 usec ago) CmdIf1=0xec (-1 usec ago)
00:00:24.226660 PIIX3 ATA: Ctl#0: finished processing RESET
00:00:24.327024 PIIX3 ATA: Ctl#1: RESET, DevSel=0 AIOIf=1 CmdIf0=0xec (-1 usec ago) CmdIf1=0xec (-1 usec ago)
00:00:24.337089 PIIX3 ATA: Ctl#1: finished processing RESET
00:00:26.885535 PIT: mode=2 count=0x10000 (65536) - 18.20 Hz (ch=0)
00:00:26.956961 PIIX3 ATA: LUN#0: disk write error (rc=VERR_INVALID_PARAMETER iSector=0x103e1 cSectors=0x8)
00:00:26.960788 PIIX3 ATA: LUN#0: disk write error (rc=VERR_INVALID_PARAMETER iSector=0x103e1 cSectors=0x8)
00:00:26.962993 PIIX3 ATA: LUN#0: disk write error (rc=VERR_INVALID_PARAMETER iSector=0x103e1 cSectors=0x8)
