Guide to Computer Forensics and Investigations8 Determining the Best Acquisition Method (continued) Bit-stream disk-to-image file Most common method Can make more than one copy Copies are bit-for-bit replications of the original drive ProDiscover, EnCase, FTK, SMART, Sleuth Kit, X- Ways, iLook Bit-stream disk-to-disk When disk-to-image copy is not possible Consider disks geometry configuration EnCase, SafeBack, SnapCopy.Guide to Computer Forensics and Investigations7 Determining the Best Acquisition Method Types of acquisitions Static acquisitions and live acquisitions Four methods Bit-stream disk-to-image file Bit-stream disk-to-disk Logical disk-to-disk or disk-to-disk data Sparse data copy of a file or folder.Garfinkel of Basis Technology Corporation Design goals Provide compressed or uncompressed image files No size restriction for disk-to-image files Provide space in the image file or segmented files for metadata Simple design with extensibility Open source for multiple platforms and Oss File extensions include.afd for segmented image files and.afm for AFF metadata Guide to Computer Forensics and Investigations6 Advanced Forensics Format Developed by Dr.Guide to Computer Forensics and Investigations5 Proprietary Formats Features offered Option to compress or not compress image files Can split an image into smaller segmented files Can integrate metadata into the image file Disadvantages Inability to share an image between different tools File size limitation for each segmented volume.Guide to Computer Forensics and Investigations4 Raw Format Makes it possible to write bit-stream data to files Advantages Fast data transfers Can ignore minor data read errors on source drive Most computer forensics tools can read raw format Disadvantages Requires as much storage as original disk or data Tools might not collect marginal (bad) sectors.Guide to Computer Forensics and Investigations3 Understanding Storage Formats for Digital Evidence Three formats Raw format Proprietary formats Advanced Forensics Format (AFF).
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Guide to Computer Forensics and Investigations2 Objectives List digital evidence storage formats Explain ways to determine the best acquisition method Describe contingency planning for data acquisitions Explain how to use acquisition tools Explain how to validate data acquisitions Describe RAID acquisition methods Explain how to use remote network acquisition tools List other forensic tools available for data acquisitions.Chapter 4 Data Acquisition Guide to Computer Forensics and Investigations Fourth Edition.
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