Why Flash Media Will Burn You - Page 3
Most drive manufacturers don't tell you whether the Flash technology they use is SLC, MLC, or TLC. As we outlined above, particularly low cost TLC Flash can lose data very quickly, corrupting your data and files.
High temperatures, or humidity can cause shorting of circuit boards or corrosion of contacts,
Flash data is frequently lost by removing the flash media from the computer or device incorrectly, or while data is still being transferred, causing file system damage, and in rare instances, this can also cause cell damage.
It is extremely important to safely remove Flash memory from a device and never unplug a USB Flash drive while reading or writing information.
Furthermore, of all that isn't enough...
Deleted files on FLASH drives are not deleted. They are in fact simply hidden. Why? Flash uses the FAT (File Allocation Table) format to make it easy to use on multiple operating systems and devices. As Wikipedia succinctly explains it, "The FAT file system is a legacy file system which is simple and robust. It offers good performance even in light-weight implementations, but cannot deliver the same performance, reliability and scalability as some modern file systems. It is however supported for compatibility reasons by virtually all existing operating systems for personal computers, and thus is a well-suited format for data exchange between computers and devices of almost any type and age from the early 1980s up to the present." Therefore, when you "delete" a file, it just removes it from the directory on the drive, but the data contained inside the file is still there, easily recoverable by prying unauthorized eyes.
USB Flash drives and Flash media certainly have their place, enjoy their convenience, and novelty factor, just use them wisely. Never put anything on a flash drive that you can't afford to lose forever.