HP Prime problem. Calculator resetting itself

[cyrille de brébisson]

Hello

> Flash blocks marked as "bad" are generally not an issue at all. Most flash chips have at least a few bad blocks.
> The only time it really is a problem is when a block decides to fail during operation and wipe something out. This is normally quite rare though.

Actually, it is even "better" than that.

All flash have bad blocks. This is normal for flash technology.
All flash do slowly "grow" more and mode bad blocks. This is also normal (wear).
Flash do (normally) never fail on write operations. This is because write are in fact erase operations (flip bits from 1 to 0) as the default state for a 'clear flash' is all one.
Flash can fail on clear operations (set all to 1), which is performed before any writes.

Flash do return suxess/fail when clear and write operation are performed. This allows the operating system to act on such failures and relocate the bad sector somewhere else...

Flash is a great technology, with known issues and well understood workaround to deal with them.

Cyrille