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Recovery on Damaged File Systems
BMP Signature Format: Documentation & Recovery Example
BMP (bitmap image) files start with a signature BM and the next 4 bytes contain file's length.
Let's examine this particular BMP image: 
GIF Signature Format: Introduction & Recovery
Developed by CompuServe in 1987, a bitmap image format known as GIF (Graphics Interchange Format has since received widespread use on the internet due to its wide support and portability. GIF format supports up to 8 bits per pixel for each image, allowing a single image to reference its palette of up to 256 different colors chosen from the 24-bit RGB color space.
JPEG Signature Format: Introduction & Recovery
JPEG is an acronym for Joint Photographic Experts Group, which was formed between ISO/IEC JTC1 and ITU-T. During the 1992 this committee created and released the JPEG format and during the 90’s they continued to update it and create its variations.
CorelDRAW CDR Signature Format: Introduction & Recovery
CDR file format was developed by Corel Co. in 1989, and it was an entirely proprietary Corel file format. It was mainly used for vector graphic drawings, and it could be recognized by the "WL", the first two starting bytes of the file. With CorelDRAW 3, CDR has changed its format and its name to a Resource Interchange File Format (RIFF) envelope. The new format could have been recognized by the four starting bytes ("RIFF") of the file, and by the "CDR*vrsn" in bytes 9 to 15. Corel continues to be the proprietary owner of the data chunk of the RIFF file format.
