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4. Logfile Structure

The logfile is a text file easy to read and edit. It is formed of two parts, the status line and the list of data blocks.

NOTE: Logfiles generated by a version of ddrescue prior to 1.6 lack the status line. If you want to use an old logfile with ddrescue 1.6 or later, you will have to insert a line like ‘0 +’ at the beginning of the logfile.

The first non-comment line is the status line. It contains a non-negative integer and a status character. The integer is the position being tried in the input file. The status character is one of these:

Character

Meaning

'?'

copying data

'*'

trimming bad areas

'/'

splitting bad areas

'-'

retrying bad hardware blocks

'F'

filling specified areas

'G'

generating approximate logfile

'+'

finished

Every line in the list of data blocks describes a block of data, and contains 2 non-negative integers and a status character. The first integer is a position in the input file, the second is the size (in bytes) of the data to be copied. The status character is one of these:

Character

Meaning

'?'

non-tried

'*'

bad area non-trimmed

'/'

bad area non-split

'-'

bad hardware block(s)

'+'

finished

And here is an example logfile:

# Rescue Logfile. Created by GNU ddrescue version 1.10
# current_pos current_status
0x00120000 ?
# pos size status

0x00000000

0x00117000

+

0x00117000

0x00000200

-

0x00117200

0x00001000

/

0x00118200

0x00007E00

*

0x00120000

0x00048000

?

Any line beginning with ‘#’ is a comment line. The blocks must be contiguous and non-overlapping.

If you edit the file, you may use decimal, hexadecimal or octal values, using the same syntax that integer constants in C++.


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