Sony MZ-RH10 Hi-MD Music Transfer Version 1 for Mac (User Manual) Operating Instructions Manual page 66

The storage space for each disc (formatted with the recorder/the
SonicStage software)
Disc type
60-minute
standard disc
74-minute
standard disc
80-minute
standard disc
1GB Hi-MD disc
1)
This is space that is used for managing the files on the disc.
2) The size of the disc management space changes according to the operating conditions of your computer
and other factors. Therefore, the actual space available for use may be lower than that displayed by
Windows Explorer.
66
Total size
219 MB
(229,965,824 bytes)
270 MB
(283,312,128 bytes)
291 MB
(305,856,512 bytes)
964 MB
(1,011,613,696 bytes)
Disc management
1)2)
space
832 KB
(851,968 bytes)
832 KB
(851,968 bytes)
832 KB
(851,968 bytes)
832 KB
(851,968 bytes)
Free space
218 MB
(229,113,856 bytes)
269 MB
(282,460,160 bytes)
290 MB
(305,004,544 bytes)
963 MB
(1,010,761,728 bytes)