From Just Solve the File Format Problem
Toast is CD Burning software for Macintosh first developed by Miles Software GmbH (Astarte), then around 1997 bought by Adaptec. Adaptec spun its disc burning software to a new name, Roxio in 2000. Later bought by Sonic.
- Early versions of Toast software would save a disc image with no extension, as was common for Macintosh systems, but would add "•image" to the end.
- Starting In Toast 5.1 (2002), the extension ".toast" was added, probably to be compatible with Mac OS X.
- In Mac OS X, it seems .toast files can be renamed to .iso with full compatibility.
- When saving an Audio CD to a disk image, Toast saves image to the Sound Designer II .sd2f format.
- Early •image & .toast files begin with the hex values "
45 52 02 00" which are an Apple Partiton Map. Later versions don't seem to have this header.
- Most disc images and also the project files have the text string "TOAST ISO 9660 BUILDER COPYRIGHT (C) 1997 ADAPTEC, INC. - HAVE A NICE DAY" with the difference of date and ownership, ROXIO, SONIC is later versions.
- Examples from Internet Archive: , , , 
- https://telparia.com/fileFormatSamples/archive/iso/ *.toast