Computer Systems Forensic Analysis

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Computer Systems Forensic Analysis
Overview of Cybercrime
Introduction to Digital Forensics
Obtaining Evidences
Data Organization
Storage Devices
Volumes and Partitions
RAM Analysis
Mobile Forensics
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Identify DCO
Remove a DCO area

Device Configuration Overlay

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Last updated 11 months ago

Device Configuration Overlay (DCO).

added in ATA-6.
with DCO, both BIOS and OS see the same size.
DCO removable is permanent (HPA remotion can be temporary).
allows to hide the disk's real capacity.
- PC makers can buy different brands of discs with different sizes and set them to be the same size.
HPA and DCO can coexist on the same disk.

Identify DCO

on the Linux command line: hdparm --dco-identify /dev/sdX

compare values with: hdparm -Iv /dev/sdX

Remove a DCO area

Linux command line:

with hdparm tool.
it is possible to remove, but not to create a new one.
WARNING – it can destroy data permanently.
to remove DCO and set the disk with the real size.
- hdparm --yes-i-know-what-i-am-doing --dco-restore /dev/sdX