dcfldd

About dcfldd

From Debian's package description

dcfldd was initially developed at Department of Defense Computer Forensics Lab (DCFL). This tool is based on the dd program with the following additional features:

• Hashing on-the-fly: dcfldd can hash the input data as it is being transferred, helping to ensure data integrity.
• Status output: dcfldd can update the user of its progress in terms of the amount of data transferred and how much longer operation will take.
• Flexible disk wipes: dcfldd can be used to wipe disks quickly and with a known pattern if desired.
• Image/wipe verify: dcfldd can verify that a target drive is a bit-for-bit match of the specified input file or pattern.
• Multiple outputs: dcfldd can output to multiple files or disks at the same time.
• Split output: dcfldd can split output to multiple files with more configurability than the split command.
• Piped output and logs: dcfldd can send all its log data and output to commands as well as files natively.
• When dd uses a default block size (bs, ibs, obs) of 512 bytes, dcfldd uses 32768 bytes (32 KiB) which is HUGELY more efficient.
• The following options are present in dcfldd but not in dd: ALGORITHMlog:, errlog, hash, hashconv, hashformat, hashlog, hashlog:, hashwindow, limit, of:, pattern, sizeprobe, split, splitformat, statusinterval, textpattern, totalhashformat, verifylog, verifylog:, vf.

From Debian's description of the dcfldd package, under that package's license.