Low level Disk Search

[GaryT]

Does anyone know of a program that will search a Linux disk at low 
level, seeking out character strings etc.

This is NOT the find program. I'm looking for a little routine that 
reads straight off the disk, disregards file boundaries, can't be 
bothered about the function of the file it's looking in, etc. This 
routine will start at Sector 0 and just read characters, looking for a 
particular string match.

There are plenty that operate under Windows, I've used them over the 
years, but finding similar software to operate under Linux is not an 
easy task. It seems most people can't see anywhere past GREP, or FIND.

Much appreciate any help
GT