CVR recording
CVRs are required to have an independant backup supply that lasts 10mins after main power is removed.
The CVR memory will be discrete memory devices not SSD. As in the discussion above, the software reading and writing memory will be to DO178.
Therefore any and every action (if it was) of an SSD drive would have to be specified and software tested.
The memory devices will always be older technology because every time a device is changed, e.g. size or manufacturer, they have to be re-qualified (crash tested, cooked, shake'n baked). The temperature and g-force is large.
No compression except dynamic on the audio amplitude is allowed. Therefore long spells of no speach will take exactly the same memory as speach. How do you determine what speach or noise, bangs cruches beeps etc you want to record?
The recorder will have the last 2 hours and that is it.