Akai MPC 4000 Reference Manual page 127

Global mode
D CPU bar
The length of this bar indicates the amount of free memory for the MPC4000's work area.
The percentage of free memory is shown at the right of this bar.
E Multis field
Indicates the number of multis in the memory of the MPC4000.
F Programs field
Indicates the number of programs in the memory of the MPC4000.
G Samples field
Indicates the number of samples in the memory of the MPC4000.
Rearranging data in memory to allocate free space
Here's how you can rearrange the data in memory so that the free area occupies a single
contiguous space. (This is called the "defragmenting" function.)
Hint: As you delete and edit sample data within memory, the data in memory may become fragmented.
If data becomes fragmented, it will become impossible to allocate contiguous free space, meaning that
the amount of usable memory may be less than the amount of free memory that is displayed. If you
want to take full advantage of the free memory area, execute this Memory Defragment operation to
defragment the memory.
1. In the Memory page, press the [F6] key (DEFRAG).
The Memory Defragment popup window will appear, and the data in memory will be
rearranged. When processing has been completed, the popup window will automatically
close, and you will return to the Memory page.
118