Indeed they have...
As you'll see some way into this discussion: http://line6.com/sup...20d-15-minutes/.
Forgive me repeating my excerpt from that discussion, but I feel that it may still be the best advice available...
"...Having since had some time to raise these issues with a few of the more experienced digital systems folk from among my broadcast engineering colleagues, I can now best summarise their general suggestions for "best practice" as being along these lines :
- Re-format portable media before any fresh project,
- Use the highest speed and largest capacity media that the system can employ (or that finances allow),
- Avoid the storage of different formats in the same portable device ...and
- Also avoid storing to more than roughly 80% of a given portable device's stated capacity.
They say that failure to observe any or all of those four conditions won't necessarily cause problems, but equally ...may have many baffling and bizarre consequences for digital systems.
According to my colleagues, it would seem that the so-called "free" software (usually merchandising) that's pre-loaded onto supposedly "ready to use, pre-formatted" SD cards (and/or "memory stick" portable USB drives) is one of the worst offenders, to the extent that they regard it as malware worthy of quarantine."