I'm developing an application for interfacing Pen drive in Windows XP. My application gets connected with Pen drive and tested sample read/write sectors. I need to store some confidential values in the pen drive that should not be change by anybody. In FAT32 Boot Record structure, we have 12 bytes of reserved space at offset 34h. I write/read values in the reserved space of the FAT32 boot record, its working fine. My question is, will i write in these space or will it affect anywhere at anytime. Please clarify my doubt.