[EMAIL PROTECTED] wrote: > [EMAIL PROTECTED] wrote: >> So I assume the best idea is to have a program which scans directory >> structure for unused sectors and fills them with zeros (including >> direc= tory entries of erased files). Does anybody know what program >> can do this? > > Look up SDU or IBU that I used to flog. > > Although not ideal they are written in basic and so will be easily > modified. > They scan the directory and calculate which sectors are "live" and > copy only those. So erased files wouldn't copy to a blank disk.
Realistically it shouldn't be hard to write a program to go through the directory sectors on a disk, OR the "live" sectors of each (undeleted) directory entry and then write 0s to each sector which isn't live. You could even do it (slowly!) in BASIC - I forget the BASIC syntax for sector disk access - is it READ FROM and WRITE TO or something? If you're talking disk images, it would be really easy to write a program to modify the image to do it, given the Masterdos manual (that does contain the disk format info, doesn't it?). G ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
