Sony Cyber-shot DSC-HX99 Help Manual page 471

Help Guide
Digital Still Camera
DSC-HX99
USB LUN Setting
Enhances compatibility by limiting of USB connection functions.
MENU → (Setup) → [USB LUN Setting] → desired setting.
1
Menu item details
Multi:
Normally, use [Multi].
Single:
Set [USB LUN Setting] to [Single] only if you cannot make a connection.
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