Which backup program is this?

Hi, Some time ago I posted about an old Sony 650MB 5.25" MO drive that I acquired. I have now cleaned all the disks, and it seems to be working fine. Anyway, most of the disks that came with the drive contain old backups. I'm not sure which backup program was used to create the backups. I would like to find out, because hopefully then I can snoop through them more easily than having to use a disk editor. There seems to be various source code and other things on there. In the hope that someone here can point me in the right direction, here is some brief info about the backups. The backup program probably ran under OS/2. Sectors 0 to 3 inclusive contain: "MDIELS4" in ASCII 25 zero bytes a date in ASCII, e.g. "Tue Jan 12 08:48:26 1993" 0x0a, 0x00 "mondayb" in ASCII (this may be some backup ID assigned by the operator) the remainder of sectors 0-3 are all zero bytes Sector 4 begins with "MDIVOLID" in ASCII. The next significant thing is at start of sector 256: 0xEB, 0x3C, 0x90 "MDI 4.0" in ASCII. Any ideas? -- Mark