In Linux forensic imaging, what would the command dcfldd if=/dev/zero of=/dev/hda bs=4096 conv=noerror, sync accomplishes?

In Linux forensic imaging, what would the command dcfldd if=/dev/zero of=/dev/hda bs=4096 conv=noerror, sync accomplishes?

• A. Low-level format
• B. Fill the disk with 4096 zeros
• C. Copy files from the master disk to the slave disk on the secondary IDE controller
• D. Fill the disk with zeros

Answer: (D)

The command is overwriting the entire disk with zeros by using a stream of zero bytes as input. /dev/zero provides an endless supply of zeros, and writing to the destination device writes those zeros across the whole drive. The block size of 4096 bytes just determines how many bytes are processed per I/O operation. The options conv=noerror,sync ensure the operation keeps going if any read errors occur and pads any partial block with zeros so every write is a full 4KB block. The net effect is wiping the disk by filling it with zeros, which is different from a true low-level format and not about copying data from another disk. This is a zero-fill wipe.

The command is overwriting the entire disk with zeros by using a stream of zero bytes as input. /dev/zero provides an endless supply of zeros, and writing to the destination device writes those zeros across the whole drive. The block size of 4096 bytes just determines how many bytes are processed per I/O operation. The options conv=noerror,sync ensure the operation keeps going if any read errors occur and pads any partial block with zeros so every write is a full 4KB block. The net effect is wiping the disk by filling it with zeros, which is different from a true low-level format and not about copying data from another disk. This is a zero-fill wipe.