FreeBSD v7.2 amd64 release disc1: kernel panic during boot!

[rmkml]

Hi,
Im boot on FreeBSD v7.2 amd64 release disc1,
stop boot (6) and disable dma cdrom:
  OK set hw.ata.atapi_dma=0
  OK boot
  ...
  acd0: FAILURE - READ_BIG ILLEGAL REQUEST asc=0x64 ascq=0x03
  GEOM_LABEL: Label for provider ad12s1 is ufsid/472dfcdea9875215.
  Trying to mount root from ufs:/dev/md0
  Fatal trap 12: page fault while in kernel mode
  cpuid = 1; apic id = 01
  fault virtual address = 0x258
  fault code            = supervisor read data, page not present
  instruction pointer   = 0x8:0xffffffff8050119d
  stack pointer         = 0x10:0xfffffffe800159b0
  frame pointer         = 0x10:0xffffff000226aa50
  code segment          = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
  processor eflags      = interrupt enabled, resume, IOPL = 0
  current process       = 1 (swapper)
  trap number           = 12
  panic: page fault
  cpuid = 1
  Uptime: 2s
  Cannot dump. No dump device defined.
  Automatic reboot in 15 seconds - press a key on the console to abort

When I boot with FreeBSD v7.2 amd64 release livefs (no panic and disable 
dma), switch livefs cd to disc1 and start custom install, I have this 
warning, maybe its related?:
  User Confirmation Request
  WARNING: It is safe to use a geometry of 290718/16/63 for ad12 on
  computers with modern BIOS versions. If this disk is to be used
  on rather old machines, however, it is recommended to ensure that
  it does not have more than 65535 cylinders, or more than 255 heads
  or more than 63 sectors per track.
  Would you like that to keep using the current geometry?
click Yes and start custom install: OK

Verified iso md5 checksum: OK
No pb during boot on previous freebsd v7.1 (or 7.0) amd64 release disc1.
FreeBSD v7.2 amd64 release livefs: boot OK (no panic)
FreeBSD v7.2 i386 release disc1/livefs: boot OK (no panic)
Regards
Rmkml
Crusoe-Researches.com