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+======= Wipe disks securely =======
+====== Destroying data and devices permanently TL;DR ======
+==== HDD ====
+  - $ shred -v -n6 -z /dev/sdX (-n6 is the number of passes, when left out, 3 is standard);
+  - Remove the HDD cover, drill through the platters a few times with a metal drill;
+  - One minute in the workshop microwave;
+  - Dispose of with the electric waste.
+==== Flash storage ====
+===== Destroying data permanently TL;DR =====
+  $ sudo shred -v -n6 -z /dev/sdX (-n6 is the number of passes, when left out, 3 is standard)
+or use hdparm if devices is capable of ATA Enhanced Secure Erase
+===== Hardware-specific problems =====
+==== Flash storage ====
+Firmware abstraction, write amplification and other characteristics make flash memory potentially unreliable targets for wiping data.