There are some maintanence techniques that you can do which are found on page 184 of the Zoom manual.

Running a Scan Disk will check and fix any problems with the hard drive. This action serves to test and restore data on the internal hard disk. Perform this procedure when operation of the
MRS-1608 has become unstable.

1. Turn power to the MRS-1608 off. While holding down the [CLEAR] key, turn power on again.

2. Press the [MARK] key in the control section.

3. Use the cursor left/right keys to select the desired command.
(in this case the "ScanDisk" option).

4. Use the cursor left/right keys to select the ScanDisk function you need.
●AutoRepr (Auto Repair) This function tests all files on the hard disk and automatically repairs damaged files.

● ChekFile (Check File) This function only tests all files, but does not automatically repair them. If a problem is found, a message is displayed on the screen.

5. To execute the selected function, press the [ENTER] key.ScanDisk starts. By pressing the [EXIT] key instead of the [ENTER] key, you can cancel the operation and return to the condition of step 1.

NOTE
Once ScanDisk has started, it cannot be interrupted by the
user. Never turn power to the unit off while ScanDisk is
running. Otherwise the hard disk may be destroyed.

6. When ScanDisk is completed, press the [EXIT] key.