If 7 zip encrypted/ archived the files in the corrupt folder in the same order in which the file names appeared on the command prompt screen, then the files occurring at the start of the listing are the ones which have become corrupt. When I did (called?) '7z l a.7z > list.txt' in command prompt mode, a list of files appeared. I have already backed up other data from all the partitions of the HDD.Īll bytes from offset 00000000 to 021EFFF0 (inclusive in HxD) are 55. While I had created the archive in version 9.20, I used 7-Zip 9.38 beta version to get the extraction results described above today.
I had neither tested the archive nor opened it after creating it. I checked the volume for errors (chkdsk utility? from My Computer menu) yesterday and found none. The medium was (a partition/ volume of) the HDD. I do not know how to tell if it was a "solid" archive. However, I could not trace any extracted file in its original form in the nominated subdirectory on the file explorer. The compressed and uncompressed sizes of the archive appear right. The filenames and extensions appear right.
The second row or item reads : Warnings: Headers Error. I manually changed the hex values in the first two rows, which had 16 pairs of characters in each, and on entering the password, the program returned a list of files which seems about right in its length and has the format '(Item number) Data error : Wrong password? : path/filename.***' for every file. I would greatly appreciate any help that I might get. The archive contains more than ten years of my personal notes and loosing these would be very sad for me. I am not conversant in security and compression matters. I tried to make sense of the discussion on the forum but could not. Unfortunately I have shredded the original source files. The first three rows (48 bytes?) from the hex reading of the file are:ĥ5 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55Īs are several hundred following rows. Four days later the archive refused to extract with the error message "Can not open file 'a.7z' as archive". Most of the files were xlsx, txt, pdf, and doc. I archived some files using the 9.20 version four weeks ago.
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