So I found this link Does the first sector (MBR) of a flash drive get executed on insertion into a computer and was wondering about the specifics of the USB SCSI packets mentioned in the answer. First, where are they stored in the flash drive? If I do a hex dump of my USB drive, will I be able to view the packets and if so at what memory registers? Second, how does the computer handle nonstandard packets if every company uses different instruction sets? Third, how does one go about modifying the packets returned by the drive?
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1) firmware can be placed most anywhere in the drive's memory... are you wondering how to access it? 2) afaik there is a universal standard for scsi packets (check wikipedia: http://en.wikipedia.org/wiki/SCSI#SCSI_command_protocol) 3) the packets are firmware and can only be modified through painstaking disassembly