dd
A command that copies data block by block, used to image disks, write boot media and overwrite devices.
In more detail
dd if=/dev/sda of=disk.img copies a whole device; a wrong of= destroys data instantly. ddrescue copies a failing disk, skipping bad areas and returning to them later.
Taught in
- Friday's Backup, Monday's Restore: Incrementals, Images And Compressed Logs — CompTIA Linux+ (XK0-006) Exam Prep
- Twelve Old Servers, Two New Hosts: KVM, QEMU, libvirt And Disk Images — CompTIA Linux+ (XK0-006) Exam Prep
- What Changed Last Night? Integrity, Scans, Benchmarks And Secure Deletion — CompTIA Linux+ (XK0-006) Exam Prep
- No Space Left, Says The Disk With Room To Spare: Inodes, Held Files, Corruption And Repair — CompTIA Linux+ (XK0-006) Exam Prep
- Swap: Partitions, Volumes, Files And Priorities — Linux Foundation Certified System Administrator (LFCS) Exam Prep
- Files: Globs, Copies And Compression — LPIC-1 Linux Administrator (101-500 and 102-500) Exam Prep