Sony STR-DN1050 Help Manual page 233

Help Guide
MULTI CHANNEL AV RECEIVER
STR-DN1050/STR-DN850
[Reading] is displayed for an extended time, or it takes a long time before playback starts.
The reading process can take a long time in the following cases:
There are many folders or files on the USB device.
The file structure is extremely complex.
The memory capacity is excessive.
The internal memory is fragmented.
We therefore recommend following these guidelines:
Total folders on USB device: 256 or less (including [ROOT] folder)
Total files per folder: 256 or less.
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