dd if=/dev/sda bs=512 count=1 | hexdump -C
nebo
dd if=/dev/sda bs=512 count=1 of=sdambr.bin file sdambr.bin sdambr.bin: x86 boot sector; partition 1: ID=0xfd, active, starthead 32, startsector 2048, 195309568 sectors; partition 2: ID=0x5, starthead 254, startsector 195313662, 1758210050 sectors, code offset 0x0