usb drive EEPROM IC how is memory read-only blocked and unblocked?
I initially misread your question, but it seems like the link might still be of some use to you. I think most USB-flash memory controllers (like the Alcor ones in the blog post here) will have some application which can be used to program low level configuration on the controller. Specifically, I wonder if the "low level" format option will allow you to bypass the read-only sectors.

Actually, this link seems to have software that supports Skymedi controllers. Also, that site does seem sketch as well, so be sure you scan any executables linked for viruses/malware etc...