Simultaneous copying from two sources

Question

Backup

There is a DVD disc with 2 identical files recorded (\backup.rar and \copy\backup.rar), the disc is overwritten.
The first file is copied up to 75%, and then it does not read, the second, on the contrary, is not read at the beginning.
Is there a program that can copy from two sources at once, that is, if some blocks are not read in the first file, then read them from the second?

Answer 1

Just today they talked about dd .
habrahabr.ru/blogs/nix/117050/#comment_3812727 :

With a little imagination, you can do a lot of things with dd. The first thing that comes to mind is to pad the file with zeros to the desired length (necessary when creating firmware partition images, for example):
dd if=/dev/zero of=new_file bs=x count=y
dd if=old_file of=new_file bs=x count=
y notrail we create a blank file of the required size, then we replace the beginning with our own data. The notrail option prevents the file from being trimmed after the operation is completed.

That. First, we read the data from file No. 2 (which is read at the end), skipping errors, then we supplement it with data from file No. 1.

Answer 2

You can try to feed them to ReGet: for example, if your computer name is “AV”, feed the reget this way - \\AV\C$\MyFolders\backup.rar - the reget will download, say up to 70%, then click on pause and in the download properties change the path to the second file like \\AV\C$\MyFolders\copy\backup.rar and continue downloading.

Answer 3

Fine work, try WinHEX - it can read files byte by byte.

Answer 4

try IsoBuster, you see, and everything counts without shamanism. in my opinion, it seemed to have a function to “take problem areas” from another image. I just don’t know how it can be done with files in different folders ... but you try.