tldr/pages/osx/dd.md

dd

Convert and copy a file.

• Make a bootable usb drive from an isohybrid file (such like archlinux-xxx.iso):

dd if={{file.iso}} of=/dev/{{usb_drive}}

• Clone a drive to another drive with 4MB block and ignore error:

dd if=/dev/{{source_drive}} of=/dev/{{dest_drive}} bs=4m conv=noerror

• Generate a file of 100 random bytes by using kernel random driver:

dd if=/dev/urandom of={{random_file}} bs=100 count=1

• Benchmark the write performance of a disk:

dd if=/dev/zero of={{file_1GB}} bs=1024 count=1000000