|Even if You do a hard format (on another system), Your ancient VMS system 5.5 does not support this disk.|
See e.g the topic
ion the VMS ITRC forum.
You have to upgrade to a newer VMS version, 6.2 or 7.3, then the disk might work.
One of the reasonsVMS doesn't like the disk, is the "write cache enable" bit and the " the read-write recovery flags" set in the drives firmware. If You have a system where You can run a SCSI utility to reset this bit, then do it and retry. Such a utility is included in newer VMS systems as sys$etc:scsi_mode.
I don't have the seagate model list ready accessible, but another reaon could be disk capacity restrictions on VMS 5.5 (4 or 9GB?), which also are relaxed at VMS 6 or 7.
Joseph Huber, http://www.huber-joseph.de