The zipped image files in this directory are raw sector images of the actual
RX50s.  The images may be copied onto disks by simply copying each 512 byte
block of the file into the next sequential sector (starting at track 0 sector
1 and continuing until track 79 sector 10), or they may be mounted under PUTR
to get at the individual files.

To write disks using PUTR, do the following:
(C:\)>FORMAT B: /RX50
(C:\)>MOUNT B: /RX50 /FOREIGN
(C:\)>COPY/FILE/DEV/BINARY file.bin B:

If you want to take a look at the disk now, type:
(C:\)>MOUNT B:
(C:\)>DIR B: