====== Disks ======


<code>

Disk               User Addressable                        Host        Device 
Firmware           Data Area                               Protected   Configuration
Area              (Partition table, partitions)            Area (HPA)  Overlay (DCO)
-n ---- | ---------------------------------------------- | -----------| ------------ n+

</code>

  * Firmware area
    * firmware code
  * UADA
    * Visible storage space for OS
  * HPA
    * Known by BIOS, recovery partition and diagnosis tools
  * DCO
    * Used by manufacturer for configuration 
  * HDD
    * No deletion, blocks(?) marked as deleted


  * SSD
    * Deleted on block level
    * Wear Leveling, TRIM, 
    * HPA/DCO can be enabled (?) [[https://www.thomas-krenn.com/en/wiki/SSD_Over-provisioning_using_hdparm]]