Instead of that ugly -o perhaps go simpler.
# mount -t ntfs -o umask=0222 /dev... /mnt...
That should mount it read-only. Although with all that dmraid stuff perhaps it's encrypted with bitlocker or something else exotic. Or it's not ntfs.
# mount -t auto -o ro /dev/... /mnt/...
Where ... is whatever applies in your circumstance, not a literal parameter.
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