This will prevent items from being deleted from that virtual CD, but is not ideal for a system cleaning disk because the second partition can still be written to and infected.
#USB WRITE PROTECTOR HOW TO#
Looking for a USB Flash Drive with Read Only or Write Protect Switch describes how to create a customized U3 partition based on an ISO file that will mount as a virtual CD-ROM.
#USB WRITE PROTECTOR SOFTWARE#
There are a few software approaches that you can use in a pinch, but they’re mostly Windows-specific and it may be possible to bypass them – even if it seems unlikely. Here are some ideas that may help fill your needs. The user can still re-format the device into a regular key to re-cycle it for another usage (for example, with fdisk) delete, rename, move) or from the files and folders being modified by a standard applications (e.g. It protects the contents from modifications typically done from the shell (e.g. John Reasor mentions utilities able to fill all free space on the device, making it impossible to create new files (see below).ĭoes there exist a general solution to store non-modifiable contents on a USB key? Besides, this solution cannot be applied universally because it requires knowing which chip is used in the drive, and the existence of publicly available tools to re-program the device.
#USB WRITE PROTECTOR DRIVERS#
The problem is that it is very confusing for the users: the write-protected partition can appear as a CD-ROM drive (which it is not), after insertion some drivers are apparently installed on the computer (in fact they are not really drivers), and it can lead to prompting for reboot. With microcontroller-specific software is possible (if supported by the chip) to re-partition the key so it displays for example a write-protected and a read-write partition. Formatting as ISO9660/CDFS makes it read-only under Linux and Mac OS X, but unfortunately the contents are not readable anymore from Windows. Formatting the disk as UDF makes it read-only under Windows XP SP3, but read-write in Windows Vista, Windows 7, Linux and Mac OS X. There is a slightly stronger write-protection available for NTFS, which can be achieved by removing write privileges from "All Users" it will make the files read-only to every account, except "Administrator". With a FAT32 filesystem the only solution seems to be setting the files "read-only". Unfortunately this is not always the case. Some keys have a switch which makes them read-only. The idea is to prevent its contents from being inadvertently removed by the user or changed by malicious programs - not to restrict the re-cycling of the key for something else. I'm looking for a solution to write-protect the contents of a USB key.
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