flash reliability

No Moving Parts
Not likely to fail as a read-only storage medium

Flash wear
Not typically a problem with anything manufactured in the last 10 years
Better luck with SLC than MLC or TLC flash drives
Not what we want to address in a read-only environment

Power failure
A significant problem for read/write flash
Mai Zheng did a presentation at the USENIX FAST'13 conference about this
Understanding the Robustness of SSDs under Power Fault
"thirteen out of the fifteen tested SSD devices exhibit surprising failure behaviors under power faults, including bit corruption, shorn writes, unserializable writes, metadata corruption, and total device failure"
Gets worse for inexpensive USB and SD/CF drives and their controllers