Occasionally a few of these may show up in the recovery list with incorrect and large sizes. Data Rescue is able to filter out the vast majority of these bad entries, but not all of them. In the course of scanning the media, Data Rescue will often come across bad files and catalog entries. The second reason why the found files may total more than expected is the possibility of anomalously (and incorrectly) large files. (Data Rescue does not currently have the capability to automatically cross correlate these sets of files, but may do so in a future version.) So if you elect to recover everything, it will often be the case that the total space required exceeds the original media size. These methods will often locate many of the same files twice - once under a catalog folder and again under the CBR folder. There could be two reasons for this, as explained below: When you do a Deep scan, Data Rescue uses two different algorithms to locate files. Why do my found files total more than the size of the original drive? We've also seen some hard drives appear intermittently depending on the nature of the problem with the drive, so you may want to give it several tries, shutting the computer down in between, to see if the drive will re-appear to the system. If possible, you could also try mounting the drive into an external enclosure and then see if the computer will detect the drive, we've seen this work in some cases.

If the drive fails to show up in Disk Utility, this means that the computer does not detect the presence of the drive, and no software will be able to access it either. You can double-check that the drive can be seen by your computer by using Disk Utility to see if it can detect the drive. In this latter case, you might try some or all of the following things to see if your device can be made to appear: Double-check the drive cables and power source remove/reattach the drive and/or power cycle it power down and restart your computer. In this case, no software will be able to scan your device.

Finally, it could be possible that your drive is malfunctioning to the point where your computer is not able to talk to it at all, in which case even the device name will not appear. If that is the case, you will need to choose the device name for scanning rather than the volume.

Or it may be that Data Rescue can see the device, but is not able to recognize a volume structure on the device. If the volume you are looking for still does not appear, it may be because Data Rescue is unable to find the correct name for it, in which case it may show some other name such as unknown for the volume name. Try the File -> Refresh Drives List menu item. If you have attached a drive with a damaged volume since you started Data Rescue, Data Rescue may not automatically notice it. This data can be found in the ‘Reconstructed Files’ folder in the results of a Deep Scan. When files are deleted, their location on the hard drive is marked as available free space and until that location is overwritten with new files, the raw data may be recoverable. This is because the metadata for the file, which includes filename, folder location and other information about the data, is lost. The reason for this is because when files are deleted, the link between the raw data on the hard drive and the filesystem is broken. If you are attempting to recover files that were deleted or files from a formatted hard drive, generally the filename and folder structure are not going to be recoverable. This data will be found in the ‘Found Files’ folder in the results a Quick or Deep Scan. If you are attempting to recover from a drive that is failing to mount and cannot be accessed through Mac OS, or from a system that will not boot, it is possible to recover folder/file structure since the data is still fully intact in most cases. The possibility of recovering data with it’s original filename and folder structure depends on the specific recovery scenario. Will this recover data with its original name and in its original sub-folder formatting?

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