Sony PEG-NR70V - Manual (Page 205)

205
Additional information
Chapter 12
Cannot operate the CLIÉ handheld for a few seconds after
inserting the Memory Stick media.
, When you insert Memory Stick media which has many audio
files recorded on it, you may not be able to operate your CLIÉ
handheld for a few seconds; this is not a malfunction.
Wait until the title of the audio file appears or the Memory Stick
indicator stops flashing.