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= kramer
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:toc:
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// Hello people reading the README source :)
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== Prelude
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VERY EARLY ALPHA -- NOT YET FUNCTIONAL
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I needed a program to efficiently repair the data on optical discs.
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== Goals
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* [*] CLI Args
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** [*] Input device
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** [*] Output file (ISO 9660)
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** [*] Repair map file
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** [*] sequence_length
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** [*] brute_passes
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** [*] Sector size override?
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* Repair Algorithm
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** Stage 1: Trial
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*** [ ] 1 - From first sector, parse forward to error.
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*** [ ] 2 - From last sector, parse backwards to error.
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*** [ ] 3 - From center of data for trial, parse forward to error or end of remaining trial domain.
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*** [ ] 4 - Stripe-skip remaining data, attempting to read largest trial domains first.
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**** [ ] If data keeps reading good, no skip will occur until an error is reached.
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** Stage 2: Isolation
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*** [ ] From largest to smallest untrustworthy sequence, attempt to read each sequence at half sequence_length.
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*** [ ] Same, but at quarter sequence_length.
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*** [ ] Same, but at eighth sequence_length.
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*** [ ] By sector, parse untrustworthy sequences from start to error, and end to error. Mark mid section for brute force.
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** Stage 3: Brute Force
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*** [ ] Desperately attempt to recover data from marked sections.
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*** [ ] Attempt for brute_passes, retrying all failed sectors.
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* [ ] Repair Map
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** [ ] I'll figure out some kind of language for this...
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== License
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# kramer
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`kramer` is a data recovery utility for optical media.
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There are plans to change the project name, but during initial development it
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will continue to be referred to as kramer.
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This is still in very early development, so expect old maps to no longer work.
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## Plans
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### Core
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- [x] Mapping
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- [x] Record the state of disc regions
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- [x] Recover from saved map.
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- [ ] Recovery
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- [x] Initial
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Technically there is an outstanding issue with sleepy firmware here,
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but beside that this technically works.
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- [ ] Patchworking
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- [ ] Isolate
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- [ ] Scraping
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- [ ] CLI
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- [x] Arguments
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- [ ] Recovery progress
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- [ ] Recovery stats
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- [ ] Documentation, eugh.
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### Extra
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- [ ] i18n
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- [ ] English
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- [ ] French
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- [ ] TUI (akin to `ddrescueview`)
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- [ ] Visual status map
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- [ ] Recovery properties
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- [ ] Recovery progress
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- [ ] Recovery stats
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## Recovery Strategy
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### Initial Pass (Stage::Untested)
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Tries to read clusters of `max_buffer_size`, marking clusters with errors as
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`ForIsolation` (note that the name has not yet be updated to
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`Patchwork{ depth }`).
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### Patchworking
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This works by halving the length of the read buffer until one of two
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conditions is met:
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1. `max_buffer_size` has been divided by `max_buffer_subdivision`
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(like a maximum recursion depth).
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Effectively, it will keep running `max_buffer_size / isolation_depth;
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isolation_depth++;` on each pass until `isolation_depth ==
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max_buffer_subdivision`
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2. `buffer_size <= min_buffer_size`
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3. `buffer_size <= sector_size`
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### Isolate
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This is where we reach brute forcing territory. `ddrescue` refers to this as
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trimming. `kramer` implements the same technique. However, thanks to the
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patchworking pass, this sector-at-a-time reading can be minimized, hopefully
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reducing wear and overall recovery time on drives with a very short spin-down
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delay.
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### Scraping
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This is the pure brute force, sector-at-a-time read. This has identical
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behaviour to `ddrescue`'s scraping phase.
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