Software USB write blocker

runs on Windows
screenshot of Thumbscrew

USB thumb drives are handy little critters. Using something no bigger than a Pink Pearl pencil eraser, you can store anywhere from a couple gigabytes up to a ton of data, and then just as easily take it and stick it in your pocket. It's a long way from floppies, ZIP disks, and even CDs and DVDs. The fact that they're usable for both reading and writing data is a handy feature, unless you want to keep that from happening.

Thumbscrew is a simple app that lets you disable the ability to write to USB devices, whether they be flash drives or full-featured external drives. If you want to preserve the contents of your drive and keep it from being changed, disabling the ability to write should do the deed. It could come in handy as well if you don't want anybody nosing around your system to have the ability to stick their own drive into a USB port and start grabbing your stuff. Either way, you're not going to be able to write to that device—or any other piece of USB hardware—once it's been disabled. The publisher warns that this tool will probably do a pretty good job here, but if you've got super-secret extra-sensitive mission-critical stuff out there, you may want to opt for a more robust solution.

Thumbscrew is a free download. It's a Windows application.

Download Thumbscrew

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