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Multi-pass imaging is a process of image creation through several passes (phases). Each phase reads data from different areas of a hard drive, starting from areas with good sectors then going to slow sector areas and finishes with bad sector areas. This approach maximizes the amount of data that can be recovered from a failing drive and reduces it chances to fail during this process.
Phase 1. Copying most good data from the drive
In this phase, R‑Studio reads data from drive by sector blocks, or groups of consecutive drive sectors read in one go. The phase is performed in several steps.
Step 1. R‑Studio reads data from the drive until it runs into a block with bad or slow sector(s). Then it drops that block and jumps to another area until it finds a block with no bad or slow sectors. Then it continues reading data until it runs into another bad or slow block, and the process repeats. When this step is finished, most good data from the hard drive has been read, and R‑Studio has detected the front blocks (edges) of bad and slow sector areas.
Step 2. R‑Studio finds the rear edges of bad sector areas. It reads the skipped area from its rear end backwards until it runs into a block with a bad sector. Then R‑Studio jumps to another bad sector area and the process is going on until all bad sector areas have been processed. When this step is finished, some good data from the hard drive has been read, and R‑Studio has detected the rear edges of bad sector areas.
Step 3. R‑Studio reads data from slow sector areas. It does that much the same way as for bad sector areas. When this step is finished, good data from slow sectors on the hard drive has been read, and R‑Studio has detected the rear edges of slow sector areas.
Step 4. R‑Studio finds the rear edges of bad sector areas in slow sector areas. When this step is finished, some new good data from slow sectors on the hard drive has been read, and R‑Studio has detected the rear edges of all bad sectors within slow sector areas.
Step 5. R‑Studio tries to read all skipped sector blocks. This is done without skipping bad sector blocks and checking read speed against minimum I/O rate.
When Phase 1 is completed, R‑Studio has read most of readable data and detected front and rear edges of all bad sector areas.
R‑Studio tries to read the rest of data in the next phases, and does that sector by sector (rather than blocks).
Phase 2. Trimming
R‑Studio detects the front and rear sectors of bad sector areas. When this step is finished, some new good data from bad sector areas has been read, and R‑Studio has detected the front and rear sectors of all bad sector areas.
Phase 3. Scraping
R‑Studio tries to read data from bad sector areas sector by sector.
Phase 4. Retrying (mostly optional)
R‑Studio tries to read data from bad sectors through several attempts.
You may read more about this process in our article Multi-pass imaging in R-Studio
To create an image through multi-pass imaging,
• Select the object and select Create Image on the Drive menu
• Right-click the selected object and select Create Image File on the context menu
|Specify image options, a file name, and destination for the image on the Create Image dialog box and click the OK button
Specifies the name and path for the image file
Compressed image (R-Drive Image compatible): If this option is selected, R‑Studio will create an image file which can be compressed, split into several parts, and password-protected. This image file is fully compatible with the images created by R-Drive Image , but incompatible with the previous versions of R‑Studio .
Byte by byte image: If this option is selected, R‑Studio will create a simple exact copy of the object.
VMDK (ViMware Virtual Machine Disk) image: If this option is selected, R‑Studio will create an image of the VMware virtual disk type. Available in the Corporate, Technician, and T80+ license.
Some other image formats are also available in the Technician, and T80+ licenses. You may read more about these formats in the Supported Virtual Disk and Disk Image Formats page.
A file with the sector map of the object to image. Optional for the RDI image type, mandatory for the byte-by-byte and VMDK image types.
Enable multi-pass image creation
Turns multi-pass imaging on and off.
Data to process
All data : All data on the disk will be imaged.
Existing files only (FS bitmap) : Only the disk's area where existing files reside will be imaged.
Unused clusters only : Only the disk's free space will be imaged.
You may image the existing files first and then unused clusters.
Perform reading in reverse order if possible
Switches the direction of all phases/steps to reverse.
Minimum skip size
Minimum size of drive area to skip when a bad sector is encountered.
Maximum skip size
Maximum size of drive area to skip when a bad sector is encountered.
Number of retries (Retrying phase)
The number of read attempts in the Retrying phase.
Disable imaging phases
Multi-imaging phases that can be skipped.
|R‑Studio will start creating the image, the Progress message showing the progress.
You may change operation parameters during image creation. Click the Options button and change them accordingly.