repair a disc under QNX

some days ago I saved some of my important hardware layout files on disc
(under windows). Then I edited them (loading them from disc without saving
them on hard disc beforehand, this was a mistake I know) and saved them back
on disc. After saving one file I could not access the disc anymore (under
windows and dos).

Is there a possibility to read the contents of the disc using QNX? Are there
any tools to do this?

Thank you.