Data Recovery Case File · Legacy & Obsolete Media · One Copy, Now Broken
A Cracked Disc Cannot Simply Be Read, Because Reading Requires Spinning It Fast
Her enquiry is brief and the stakes in it are large. House documents that a solicitor "very nicely placed on a CD and deleted his copies", where "during moving the CD cracked in a few places, and now we might not be able to sell the house." The disc is recoverable more often than people expect — but not by putting it in a drive, because the ordinary method of reading one is what finishes a cracked disc off.
| Media | Recordable optical disc with multiple radial cracks — sole copy of conveyancing documentation; originating copies deleted by the supplying party |
| Reported situation | Property documentation supplied on a single optical disc · supplying party's own copies deleted · disc cracked in several places during a house move · no other copy held · property transaction dependent on the contents |
| Fault class | Physical fracture of optical media — recording layer intact away from the cracks; rotational stress at read speed presenting a risk of complete disintegration |
| Equipment used | Rotational risk assessed before any read was attempted · crack extent mapped under magnification and edges stabilised · read performed at greatly reduced rotational speed on controlled equipment · repeated passes with error correction applied in software · recovered documents validated by opening at full fidelity |
The decode: why a crack is dangerous, and why most of the disc is fine
How a disc stores what is on it: in one continuous spiral. The recording runs from near the centre outward, so a document is not in one place but spread along a path.
Why that is favourable here: a crack crosses the spiral rather than following it. A radial crack interrupts the track at a few points and leaves the rest of its length intact, so the loss is a fraction rather than a file.
Why documents survive that particularly well: they are small and heavily redundant. Text compresses and reconstructs from partial data far better than photographs or video.
Why an ordinary drive must not be used: it spins fast. A disc rotating at full speed is under real mechanical stress, and a crack under that stress propagates and can shatter.
Why that risk is not theoretical: a disintegrating disc destroys itself and can damage the mechanism. One attempt in a normal drive can turn a recoverable disc into fragments.
What is done instead: the cracks are stabilised and the disc is read very slowly. Reduced rotational speed keeps stress low, and controlled equipment can spend far longer per sector than a consumer drive will.
Why slow reading recovers more than speed ever would: effort per sector. An ordinary drive attempts a sector a few times and reports failure, whereas repeated passes with correction applied in software routinely return what it declared unreadable.
Why the cracks near the centre matter more than those at the edge: position. The innermost region holds the disc's own table of contents, and damage there prevents anything being located — though it can be reconstructed.
What is worth doing in parallel, and it costs nothing: asking for the documents again. Conveyancing records exist in several places — the land registry, the lender, the other side's solicitor, the estate agent — and a professional's deletion does not remove them from the world.
What must not happen meanwhile: no attempts to read it, no tape across the cracks, and no cleaning. Adhesive unbalances the disc and solvents attack the lacquer over the recording layer.
On the bench
Rotational risk was assessed before any read was attempted — optical media recording along a continuous spiral from the centre outward, so a radial crack interrupts the track at points rather than removing files, while rotation at ordinary read speed places a cracked disc under stress sufficient to propagate the fracture and shatter it. Crack edges were stabilised and the disc read at greatly reduced rotational speed, with repeated passes and software error correction returning sectors a consumer drive reports as unreadable.
The outcome
Rotational risk assessed before any read, cracks mapped and stabilised, and the disc read at greatly reduced speed across repeated passes. Free assessment, one fixed written figure including VAT. The decode: the crack crosses the recording rather than following it, so most of the spiral is untouched — but reading a disc means spinning it, and spinning a cracked disc at normal speed is how it becomes fragments.
A cracked disc holding something you need
Don't put it in a drive, don't tape the cracks, and don't clean it — reading a disc means spinning it fast, and a crack under that stress propagates and can shatter the disc entirely. Adhesive unbalances it and solvents attack the lacquer over the recording layer. Take some encouragement: the recording runs as one continuous spiral from the centre outward, so a radial crack interrupts it at a few points rather than removing whole files, and documents reconstruct from partial data particularly well. Ask the other parties for copies in parallel.
Don't put it in a drive — call Cambridge Data Recovery on 01223 655015; rotational risk assessed first, cracks stabilised, read at greatly reduced speed with correction applied across repeated passes.
Request a quote online →
Our case files are drawn from genuine enquiries received by our laboratory over the past ten years, anonymised to protect client confidentiality. Each one describes the diagnostic and recovery procedure our engineers apply to that fault, using the equipment listed.