DiskPatch and USB connected disks and devices


Using DiskPatch to recover data from USB devices.

Most current PCs allow access to USB disks (and sticks or keys) when running DOS, so DiskPatch should be able to access these disks. In many cases you need to enable a BIOS setting that enables access to USB disks from DOS; this setting will be named 'USB legacy support' or something similar. Consult your BIOS manual for more information on this.
On older PCs DiskPatch will perhaps not be able to identify USB connected disks, but there is a way to get DiskPatch to work with these disks: connect the disk using a conventional internal interface. The disk would have to be removed from its external casing and directly connected to a PC. This is the preferred way to deal with USB disks when performing repairs using DiskPatch.

Things to keep in mind:

  • Accessing USB connected devices from DOS is slow.
  • If the problem disk is the USB connected device, if possible, remove the disk from its USB casing and connect it directly to a PC's disk controller. This way you will have a much better chance of reading as many sectors as possible.
  • If the disk that is selected has no MBR, DiskPatch may ask questions about the disk's geometry (how many heads and sectors/track): some BIOS versions assign geometry based on what is in the MBR, so if no MBR is found strange geometry values are assigned. Contact DIY DataRecovery Support when this happens.
  • If USB support from DOS (using drivers or any other means) works, disks are not the only devices that can be accessed from DOS: anything that presents itself as a disk can be accessed. Think USB sticks, USB connected digital cameras etc. If these devices have partitions that have data on it, you can access (and perform recovery on) them using the described methods.
Using a USB key/stick or disk to save DiskPatch's files:
If you have no place to put the DiskPatch log files because you started DiskPatch from a CD or DVD, you can use a USB key or stick to save the files. This has the added advantage that all other files (such as undo files) are also saved to the USB device, making the recovery operation that much safer. Read more on how to do this here.