Reading from a corrupted tape


 
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Old 03-28-2008
Reading from a corrupted tape

I've got a backuptape in cpio format that was accidentally overwritten with a very small batch file. As I assume that the cpio header has been overwritten, I cannot extract files from the backup in the conventional manner:

( cpio -itv </dev/rct0
cpio: this is not a cpio file, bad header)

I've tried dd if=/dev/rct0 of=output which has produced a single large file The cpio actually records the contents of three directories. As these are large I'm hoping that I can recover data from the second and third directories.

Is there a specific dd expression (or any other expression) that I can use to strip out the contents ?

All suggestions appreciated. Thanks.

Martin
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cpio.h(3HEAD)							      Headers							     cpio.h(3HEAD)

NAME
cpio.h, cpio - cpio archive values SYNOPSIS
#include <cpio.h> DESCRIPTION
Values needed by the c_mode field of the cpio archive format are described as follows: Name Description ----------------------------------------------------------- C_IRUSR Read by owner C_IWUSR Write by owner C_IXUSR Execute by owner C_IRGRP Read by group C_IWGRP Write by group C_IXGRP Execute by group C_IROTH Read by others C_IWOTH Write by others C_IXOTH Execute by others C_ISUID Set user ID C_ISGID Set group ID C_ISVTX On directories, restricted deletion flag C_ISDIR Directory C_ISFIFO FIFO C_ISREG Regular file C_ISBLK Block special C_ISCHR Character special C_ISCTG Reserved C_ISLNK Symbolic link C_ISSOCK Socket The header defines the symbolic constant: MAGIC "070707" ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
pax(1), attributes(5), standards(5) SunOS 5.11 10 Sep 2004 cpio.h(3HEAD)