The container the box wroteRecorders write into formats of their own, and an ordinary player will often refuse them outright. Re-encode one, or aim a camera at the screen, and the pixels shift, the timing shifts and the frame references go with them. We take the native file off and add a copy that opens anywhere.
The clock on the boxMore claims turn on this than on anything else the disk holds. Clocks drift, get typed in wrong on the day of installation, and are very often never adjusted for British Summer Time. Something stamped 02:10 need not have happened at 02:10. At acquisition we measure the offset against a reference and write the figure down.
Continuity on paperAn exhibit reference, MD5 and SHA-256 taken at each end, a dated record of every handover, and notes made while the work was going on. Anything produced from the master carries a reference of its own.
What would not readAn adjuster gets nothing out of a report that walks past the gaps. Material already written over is not coming back. Encrypted material without its key is not coming back either. Footage the box never recorded cannot be produced at all. We name which of those applies, and flag any pictures that survive without their timings.