Hello experts,
I have one query related to USB detection, how to identify USB is connected to machine while booting( connected USB may not be bootable media in this case HDD is bootable media). I am interested in reading the boot sector of USB media. Please tell me how can I read boot sector of USB. Please share sample assembly code related with my query.


Thanks & Regards,
Suraj

Hi,

Welcome to LQ!

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Hello Experts,
I have tried following solution for identifying connected USB to machine,
1. Contents of registers,
ah - 0x02 (for reading boot sector),
dl - 0x00, 0x01, 0x02, 0x04, 0x80 to 0x85 (drive number)
Int 13h (bios interrupt)
and checked contents of al (which contains 512 bytes of data) but not able to get correct value of last 4 bytes which are called as MBR signature (55aa).

Please guide me how can I able to identify USB which is connected to machine (PC) and read boot sector and FAT entries of same device.

Thanks in advance,
Suraj

Opps, nevermind.