Samsung UN46ES6100GXZE - Manual (Page 597)

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The availability of both recording and
the Timeshift function may differ
depending on picture quality and the
free space on the hard disk drive.
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USB memory stick is not compatible.
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When the Timeshift is used to the
gunwales, the pause may be canceled.
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If the 50MB free memory space limit
of the USB storage device is reached,
the current recording process will be
closed.