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Home / Extras / ZAR 8.4 Manual / General usage / Task types

Task types

Processing modes
Once initial setup is done, you need to specify the task to perform. ZAR utilizes different approaches tailored for the specific task.

Three modes are available

  • "Recover data from a simple volume or from a functional RAID volume" - to be used when reconstruction of the RAID/spanned volume layout is not needed. Typical scenarios include:
    • No hardware or software RAID involved
    • No software RAID involved and hardware RAID is functioning properly
    • Windows 2000/XP/2003 software RAID/spanned volume visible in Disk Management applet of the Management Console (volume should be listed as "online/healthy"; filesystem type readout is irrelevant at this point).
  • "RAID recovery" - to be used when RAID layout information is damaged and needs to be reconstructed.
  • "Image recovery" - specifically tailored to recover photos from a digital camera memory card. Only specific file types (digital images) can be recovered using this mode, and there are some limitations regarding the device type.

Of the above three, you need to select the one matching your situation.

 

"Erased" versus "Current" files
When ZAR processes the volume, it will encounter multiple files marked as "erased" by the operating system. Two "layers" of data coexist on the crashed volume. There will be files which should supposedly be accessible. We call these "current" files, belonging to the "most current layer" of the data available. On the other hand, there will be files which was routinely deleted before the volume crashed. We call these "erased" files, representing all the "past layers" of the data. ZAR can be configured in three ways
  1. Recover all files (disregarding any marks which may suggest the file was earlier deleted per user's request)
  2. Only recover "current" files - this would attempt to filter the garbage out and only extract the "most current" layer of the data
  3. Only recover "erased" files - useful for mass undeletions, this mode only recovers "past" data.
  

 

Special image recovery consideration
The digital camera typically stores all the images in the single folder and thus does not hit the demo (trial) version limit on the number of folders recovered. You may want to try "Simple volume recovery" mode against the memory card. Best yield can be achieved by running both "Simple volume" and "Image recovery" modes, making two passes on the same card, then manually sorting resulting images (you will need to remove duplicate and broken images).

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Zero Assumption Recovery though allows you to recover 4 folders at a time per run (you can do all if you pay for it), and regardless of whether you've paid for it or not, you can restore as many images as you want. Plus the smegger is quick. It went through a 40 Gig NTFS hard drive and found all lost and deleted items and such in under an hour. It also has some funky options for RAID and it talks about rebuilding a RAID partition.


 
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