Can boot to disk in single user mode. But not regular boot.

I setup an alias called md-rootdisk for booting my Solaris 10 System on a V440.
I tried to reboot using the alias md-rootdisk twice. It only worked once.
The first attempt was to single user mode. The sytem booted but there was a krtld error.
The Second attempt was a regular boot.
I'm trying to figure out why the first attempt "worked" and the 2nd didn't.
The details are below.
First Boot_
{1} ok boot -s md-rootdisk
Boot device: /pci@1f,700000/scsi@2/disk@0,0:a File and args: -s md-rootdisk
krtld: Unused kernel arguments: `md-rootdisk'.
SunOS Release 5.10 Version Generic_120011-14 64-bit
Second boot_
{1} ok boot md-rootdisk
Boot device: pci@1f,700000/scsi@2/disk@0,0:a File and args:
Can't locate boot device
{1} ok boot md-rootdisk

If the disk is a normal disk, this will get you to single user mode:
boot disk -s
In the second case, it looks like there is something wrong with the device path aliased.

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<Edited by Host>

Thomas,
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Hi ,
thanks for your advice. My problem is resolved.
The USB drive was actually a FAT filesystem.
so I did # mount -F pcfs /dev/dsk/c2t0d0p0:c /testpoint and everything went fine
I can read/write to my USB disks when i'm in
muti-user mode but when to I swith to single-user
mode ( init S ), I cannot mount it.
in Single-user mode , i started volume management
daemon :
/etc/init.d/volgmt start
#volcheck
but i'm still not able to mount it.It probably requires other items to be started
first.
I tried to mount manually:
#mount /dev/dsk/c2t0d0p0 /testpoint , i have
this
error: < mount : not a UFS magic number ( 0x0) ,
dev/dsk/c2t0d0p0 is not of this fstype.
Looks like it's assuming UFS. If this is a pcfs
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# mount -F pcfs /dev/dsk/c2t0d0p0 /testpointYeah, this was the right command, I had to specify option < -F pcfs >.
but I read somethere on this forum i had to specify :c as the drive for FAT at the end of c2t0d0p0 , so the full command was:
# mount -F pcfs /dev/dsk/c2t0d0p0:c /testpoint
>
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