Acesonic PK-6000 - Manual (Page 43)

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There is data loss occurring.
Some data loss is caused by power instability in the process of downloading. This
company takes no responsibility for any data loss. We suggest Data backup to prevent
from files being lost.
Some downloaded files that are smaller than the remaining storage space do not
play.
The internal memory chip in the player reserves 16-32KB as a memory area, and even a
file of 1 Byte will take up one whole memory area. This can affect your perception of the
amount of space available when the storage area is becoming full.