I had a few issues mounting a 1TB NTFS disk on OpenSolaris last week. After getting a few hints from one of the OpenSolaris support forums, I could get the issue fixed. All it needs is the FSWfsmisc and FSWpart to be installed on the box. The output of rmformat is very helpful to test the raw disk types, etc. The binaries installed as part of these FSW* packages like xlsmounts are very helpful.
One interesting observation is that the NTFS filesystem is mounted a little different on the local host.
PHYSICAL DEVICE LOGICAL DEVICE FS PID ADDR Mounted on
/dev/rdsk/c14t0d0p0 /dev/rdsk/c14t0d0p0 ntfs 5950 127.0.0.1:/ /mnt/test
Need another weekend to drill down a bit into that…