What will the following command accomplish?
dd if=/dev/xxx of=mbr.backup bs=512 count=1
What will the following command accomplish?
dd if=/dev/xxx of=mbr.backup bs=512 count=1
The command 'dd if=/dev/xxx of=mbr.backup bs=512 count=1' will back up the master boot record (MBR). The 'if' parameter specifies the input file, which in this case is the device (/dev/xxx). The 'of' parameter specifies the output file, where the backup will be stored (mbr.backup). The 'bs=512' sets the block size to 512 bytes, and 'count=1' means that only one block (512 bytes) will be copied. The master boot record typically resides in the first 512 bytes of a storage device, hence this command backs it up.
In UNIX and Linux, dd can be used to backup and restore the MBR. To backup the MBR, the command is dd if=/dev/xxx of=mbr.backup bs=512 count=1. To restore the MBR, the command is dd if=mbr.backup of=/dev/xxx bs=512 count=1.