Active
UNERASER

User's Guide for DOS

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User Guide for Active@ UNERASER DOS:

Dealing With the "Unknown"

The list of drives in the Logical Drive Information Display screen usually contains the names of physical disks, logical drives and un-named, Unallocated space. If a partition is damaged, however, it will be identified as the type Unknown. Contents of an Unknown partition cannot be displayed, nor can it be processed by Active@ UNERASER.

The utility understands that there is an existing partition, but as it cannot be certain what is in that space, it cannot scan it or otherwise inspect the space further.

To repair this problem, instruct the utility to bypass information in the Master Boot Record (MBR). For more information on MBR, please see the next section "Backing Up MBR, Partition Table and Boot Sector", below.

Here are the steps:

  1. Exit the Active@ UNERASER program to display the DOS prompt.
  2. Start the program again using the command line parameter -ignoreMBR. For more information, please see "Using Command Line Parameters", below. In this example use the syntax below:
    A:\>UNERASER.EXE -ignoreMBR=80h 

    This will start Active@ UNERASER while ignoring the default MBR and partition information.
  3. When the list of drives appears using this parameter, the Unknown space will appear as Unallocated
  4. Position the cursor on the Unallocated space and press [Enter] to detect and recover partitions as described in "Starting Active@ UNERASER", above.

User's Guide content

  1. PRODUCT OVERVIEW
    1. Restoring Deleted Data
    2. Files Erased
    3. Partition Damage
    4. Steps to unerase Files and Folders
  2. SYSTEM REQUIREMENTS
  3. USING Active@ UNERASER CONSOLE
    1. Starting Active@ UNERASER DOS console
    2. Starting Active@ UNERASER Windows console
    3. Command Bar Menu
    4. Performing a Drive Scan
    5. Performing a Device Scan
    6. Searching for Deleted Files and Folders
    7. Searching for Files by Name
    8. Using Hex/Text Viewer
    9. Unerasing a Deleted File
    10. Unerasing a Deleted Folder
    11. Creating a Disk Image
    12. Steps to create a Disk Image
    13. Checking Disk Image
    14. Working with Disk Image
    15. Long File Names Support
    16. Recovering Files with Long Names
  4. DATA RECOVERY TIPS
    1. Treat Recovery Area With Care
    2. Save Recovered Files Onto a Different Drive
    3. Load UNERASER to a Floppy
  5. PREPARING TO USE THE UTILITY
    1. Preparing a DOS-Bootable Floppy Disk
    2. Preparing a Bootable ISO CD-ROM Image
  6. USING COMMAND LINE PARAMETERS
    1. Overview of Command Line Parameters
  7. QUESTIONS & ANSWERS:
  8. HOW TO...

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