Command Breakdown:
dd:
Command used for low-level data copying.
if=/dev/xxx:
Input file (/dev/xxx is the source, typically a device like a hard drive).
of=mbr.backup:
Output file (mbr.backup is where the data will be written).
bs=512:
Block size is set to 512 bytes (size of the MBR).
count=1:
Only 1 block is copied (the MBR is exactly 512 bytes).
Analysis:
A. Correct: This command copies the first 512 bytes (the MBR) from the specified device to the mbr.backup file.
B. Incorrect: This command backs up, not restores, the MBR.
C. Incorrect: It does not mount the MBR; it simply copies it to a backup file.
D. Incorrect: It deals with the entire MBR, not just a partition.
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.
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