Free online B5I to ISO converter

A B5I image needs conversion when a disc utility, virtual-drive application, or archive system accepts ISO but not BlindWrite images. ISO is also easier to mount, share, and write to replacement media, although conversion can remove multi-track information.

What the B5I format is

B5I is the data image file used by BlindWrite for a sector-based copy of a CD or DVD. BlindWrite commonly creates a pair: filename.b5i stores the image data, while filename.b5t records the disc's track layout. B5I files occur in older disc backups, software distributions, game images, and other collections created with BlindWrite.

What the ISO format is

ISO is a widely supported optical-disc image format that normally represents one data track and its filesystem, such as ISO 9660 or UDF. Operating systems and disc utilities can mount an ISO, write it to optical media, or use it as virtual installation media. ISO is more compatible than B5I, but it is not designed to represent every CD layout, especially discs containing separate audio tracks, mixed-mode tracks, unusual multisession structures, or copy-protection sectors.

How to convert B5I to ISO

Using the converter on this page

1. Open the B5I conversion tool on 101convert.com.
2. Upload the .b5i file alone and choose ISO as the output format.
3. Start the conversion and download the resulting .iso file after processing finishes.

The accompanying .b5t file is not needed for this conversion. It describes track boundaries rather than supplying the disc data. It matters only for discs with several tracks, such as audio tracks alongside a data track; an ordinary data CD or DVD can be converted completely from the B5I file alone. The conversion on 101convert.com is free and does not require software installation.

Using desktop software

Some versions of PowerISO and IsoBuster can open BlindWrite images and export or save their data as ISO. In PowerISO, open the B5I through File → Open, then use the available image conversion or save command and select ISO; exact menu names depend on the version. IsoBuster can extract the data from supported B5I images, after which a compatible disc-image tool can create an ISO. Keep the original B5I and B5T files until the converted image has been checked.

Quality and compatibility limits

For a normal single-track data disc, the ISO should retain the files and filesystem, but it may not retain every raw-sector characteristic of the source. Mount the ISO and open representative files. If the source is bootable, test the converted image in the intended virtual machine or device before deleting the original.

An ISO generally cannot preserve the original arrangement of separate audio tracks or other multi-track boundaries. Keep the B5I/B5T files, or use a cue/bin-style image when exact track layout, audio playback, copy-protection behavior, or sector-level preservation is required. Conversion also does not inherently reduce the image size; the output usually remains close to the amount of disc data represented.