Convert B01 to IMG

An older disc image may arrive as a .B01 part while an emulator or imaging utility requires .IMG. Since .B01 is generally one component of a BlindWrite image set, you need the companion files to extract or convert the disc data.

What the B01 format is

.B01 is used in BlindWrite disc-image sets as a numbered image component, not usually as a complete image by itself. The set may also contain a .BWT descriptor and other files such as .BWI or .B00; the exact files depend on the BlindWrite version and how the image was created. BlindWrite users and people handling older CD or DVD backups are most likely to encounter it.

Keep every same-named companion file together. A .BWT descriptor, when present, is a better file to open than an isolated .B01. Renaming a segment does not join the parts or create a valid image.

What the IMG format is

.IMG is an ambiguous extension commonly used for raw disk images. It can represent different media and layouts, so the target program determines the required sector size, partition structure, and whether a companion descriptor is needed. An IMG may suit a utility that reads raw sectors, but the extension alone does not guarantee compatibility or smaller file size.

How to convert the image

1. Make a copy of the complete image set and identify its descriptor or original software. Do not try to convert only .B01.
2. On Windows, open the image set in IsoBuster. Use File → Open Image File and select the set’s .BWT descriptor if available. If BlindWrite created the set and the descriptor is missing, try opening it with BlindWrite; do not assume a lone segment is recoverable.
3. In IsoBuster, check that the disc and its tracks are recognized. Right-click the required data track, choose the extraction option, and save it as an ISO image. The exact extraction choices depend on the track and IsoBuster version.
4. If the target accepts ISO-formatted data with an .IMG suffix, rename the extracted .iso file to .img only after checking the target’s requirements. This changes the filename, not the image contents. For a true raw-sector IMG or a complete multi-track image, use software that explicitly supports the source set and the target’s required IMG layout.

There is no dependable online conversion for an isolated .B01 part. An online service would need the complete set, and uploading a large disc image may be impractical; use one only if it explicitly supports BlindWrite sets and the required IMG variant.

Quality and compatibility limits

Extracting a data track to ISO does not necessarily preserve the full disc. It can omit audio tracks, unused sectors, subchannel data, copy-protection information, or other disc structure. If the target needs those details, verify that the conversion is sector-level and preserves the required tracks. Test the resulting image with the application or device that will use it.