Sony ILCA-99M2 Manual page 210

Still images are recorded in a folder that is automatically created inside the DCIM folder on the
memory card. You can change the way folder names are assigned.
MENU →
1
Menu item details
Standard Form:
The folder name form is as follows: folder number + MSDCF.
Example: 100MSDCF
Date Form:
The folder name form is as follows: folder number + Y (the last digit)/MM/DD.
Example: 10060405(Folder number: 100, date: 04/05/2016)
Note
You cannot change the [Folder Name] settings for movies.
[206] Customizing the camera
Recover Image DB
If image files were processed on a computer, problems may occur in the image database file. In
such cases, the images on the memory card will not be played back on this product. If these
problems happen, repair the file using [Recover Image DB].
MENU →
1
[Enter].
Note
Use a sufficiently charged battery pack. Low battery power during repairing can cause damage to
data.
[207] Customizing the camera
Upload Settings (Eye-Fi)
(Setup) → [Folder Name] → desired setting.
Memory card settings
(Setup) → [Recover Image DB] → desired memory card slot →
Memory card settings