Is that any chance you have done something on the Mac side to stop this working ? ... ie have journalling enabled (which may need disabling) or something like that ?
The argument following the -t is used to indicate the file system type. The file system
types which are currently supported include: adfs, affs, autofs, cifs, coda, coherent,
cramfs, debugfs, devpts, efs, ext, ext2, ext3, ext4, hfs, hfsplus, hpfs, iso9660, jfs,
minix, msdos, ncpfs, nfs, nfs4, ntfs, proc, qnx4, ramfs, reiserfs, romfs, smbfs, sysv,
tmpfs, udf, ufs, umsdos, usbfs, vfat, xenix, xfs, xiafs. Note that coherent, sysv and
xenix are equivalent and that xenix and coherent will be removed at some point in the
future — use sysv instead. Since kernel version 2.1.21 the types ext and xiafs do not
exist anymore. Earlier, usbfs was known as usbdevfs. Note, the real list of all sup-
ported filesystems depends on your kernel.