Sony DSC-TX5 - Manual (Page 114)

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114 GB
File Number
Selects the method used to assign file numbers to images.
1 t (Settings) t (Memory Card
Tool) or (Internal Memory Tool) t [File
Number] t desired mode
Series Assigns numbers to files in sequence even if the recording folder or
the memory card is changed. (When the replaced memory card
contains a file with a number higher than the last assigned number,
a number one higher than the largest number is assigned.)
Reset Starts from 0001 each time the folder is changed. (When the
recording folder contains a file, a number one higher than the
largest number is assigned.)