Media being write-protected indicates that the removable device, like an external disk or memory card, is locked with a feature that prevents any addition or modification of files.

Delayed Write Failure messages are errors that occur when Windows cannot write data to a local or network disk drive. These errors can be caused by hardware, software, or driver failures.

Learn 12 effective ways to fix download or update issues in Steam caused by disk write errors ...

Disk Write Errors can occur in any game run through Steam. They happen due to the folder being write-protected or another program blocking the game from operating.

A loose or faulty cable could explain why the disk tools didn't pick up the errors, and why the whole drive disappeared.<BR><BR>Do you have the latest chipset drivers for your motherboard?