USB WriteProtector is a good, free software only available for Windows, being part of the category Security software.
It's available for users with the operating system Windows XP and prior versions, and you can get it in several languages like English, Spanish, and German. Its current version is 1.1 and was updated on 6/7/2011.
Since the program joined our selection of software and apps in 2011, it has managed to obtain 244.215 downloads, and last week it achieved 340 installations.
USB WriteProtector is a not that heavy program that will not require as much storage space than many programs in the section Security software. It's a very popular program in India, Pakistan, and Vietnam.