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License: Other
forensic remake of DD
License: Other
INSTALLATION Configuration and installation details are discussed in the INSTALLATION file in this directory. FAQ Q. Rdd used to report "time left to completion". Now it only reports how much has already been copied. Why? A. To report an estimated time of completion rdd needs to know the size of the data that is to be copied. It's easy to obtain the size of a regular file, and for regular files rdd still estimates the time of completion. Few people use rdd to copy regular files, so they don't notice this. For special files, and that includes /dev/hda and /dev/sda, there appears to be no portable way to determine their size. On Linux rdd used an lseek(2) to the end of the special file, but this trick fails miserably on platforms such as FreeBSD. For this reason, rdd now reads from a special file until it reaches end-of-file, without knowing in advance how many bytes it will read. Q. What's all this about raw devices? A. Under Linux, direct disk access is normally achieved by reading from /dev/hda or from /dev/sda. Data that is returned when you read from /dev/hda travels through the kernel's buffer cache system. This is unnecessary. More importantly, when a disk contains a bad sector, you may loose more data than just that particular sector. I have not yet figured this out in detail, but it probably has to do with reading full pages instead of individual sectors. This problem appears to go away when the disk is accessed as a raw device (e.g. /dev/raw/raw1). Support for raw-device access is entirely experimental, available only for Linux, and disabled by default. To experiment with raw devices specify --enable-raw-device when you configure rdd. To bind a raw device to a block device such as /dev/hda type raw /dev/raw/raw1 /dev/hda Q. Why do I have to specify -r when I read from a raw device (e.g. /dev/raw/raw1)? A. When applied to a raw device, read(2) does not return zero when end-of-file is reached. Instead, read(2) returns -1 and sets errno to ENXIO. This is now used as the end-of-file test for raw devices. I do not want to include this into the general-purpose test for all inputs, because it may cause rdd to ignore true errors reported by non-raw devices. Therefore, this test is activated only when you specify the -r option.
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