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#41
Some "fixed bit" drives did exist, but the manufacturers pretty much all gave up once the Windows To Go certification standard was introduced.
Anyway, a 4GB one is pretty useless other than partitioning a couple of winpe or linux installs - you need at least 32GB to be of real use for full Windows.
Then you do not understand how windows caches writing for usb drives. If it waited until all data was written before doing next activity, it would slow down the drive performance. So if you eject drive before the write cache is clear, it can fail to write data and that data is lost. Drives can get corrupted if critical data. The option is there to ensure the write cache is cleared.
However, some modern flash drives are very fast, making this less of an issue than historically. Nine+ times out of ten, removing it will not be a problem but Sod's Law says the one time it is supercritical to you is the one time it will fail on you.
I make a habit of using the safely remove hardware option. I set that Icon to stay visible in task manager.