Panasonic -eng - Manual (Page 230)

Q&A
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Recording on the SD card cannot be performed normally
• The rate of access to the hard disk may have been
dropped.
We recommend defragmenting the hard disk by use
of Windows’ Disk Defragmenter.
Select [All Programs (Programs)] from the start
menu >>[Accessories] >> [System Tools] >> [Disk
Defragmenter], then select the volume (disk) to be
defragmented, and click [Defragment] (or [OK]
depending on the OS).