You have a memory problem. If you are using a flash card for memory or a CD drive or perhaps you have configured an external drive, you need to free up some space. Try deleting tracks or songs you don't need anymore.
Each song is independent on a CompactFlash
without affecting other songs. You can give a desired song name for managing recorded songs
(see pages 23 and 91).
Recorded track data is stored in a song as mono WAV files.
The MR-8mkII can convert the two WAV files recorded on tracks 7 and 8 (L and R) to a stereo
WAV file (see page 115).
You can export the converted stereo WAV file to your USB-connected personal computer, and
use the file by a music software application or make an original audio CD on the computer using
a CD burn software application. You can also burn an audio CD by using an external CD-R/RW
drive connected via the [USB HOST] port of the MR-8mkII (see page 115 and 123)
Fostex MR 8MKII Owner Manual Page 73 Fostex MR 8MKII Owner Manual Exporting Data To Personal Computer...
Are you using the auto delete feature? Get rid of data you don't need here: http://www.manualslib.com/manual/53326/Fostex-Mr-8mkii.html?page=135#manual