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MHDR / Forensics and investigations / Forensic recovery for court

Law & evidence · recovery that can be proved

Files returned, the exhibit provably unaltered.

An ordinary recovery is judged on one thing: whether the files came back. An evidential one faces two further tests — that the source is demonstrably unchanged, and that an outsider working from the notes alone would arrive where we arrived. Hardware blocking, hashes that agree and a log kept while the job runs, not after it, answer both.

Court-ready reports under CPR 35 / CrimPR 19 Chain of custody logged Impartial and discreet

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What turns a copy into evidence.

Writes blocked in hardwareA unit placed between the exhibit and the workstation which lets reads pass and stops every write electrically. The opening rule of evidence handling, expressed as a piece of hardware.
E01, or plain rawComplete duplicates, sector by sector. Expert Witness Format comes as standard because the checksums and case details travel inside the file; a plain dd image is produced where the instruction calls for one.
MD5 and SHA-256 hashesA fingerprint calculated during acquisition and calculated once more after the image is closed. Matching values show the duplicate is faithful, and anyone may repeat the sum later and get the same answer.
Continuity recordItems are numbered and held sealed, every movement is entered in the log, and the notes are written while the work is under way; it is the first file an opposing solicitor asks to see.

Where this work applies.

Not sure? Ring the lab →
The symptomWhat we are able to establishWhat we send back
Files deleted, by accident or by intentWhether the files were ever there, the moment they went, and how much returnsThe recovered files, with the method on record
A disk somebody has wiped deliberatelyThe tool used, the time it ran, and its leftoversWhat survived the pass, and its location
BitLocker, or another encrypted volumeWhether Passware can reach the key, where the authority to try is lawfulThe volume opened, and the route in recorded
An exhibit that is also a dying diskThe unhurried imaging a failing drive needs, done without leaving the custody chainYour files back, continuity unbroken
A dispute over the sequence of eventsTimestamps and system artefacts read against each other, limits statedAn ordered account of what happened, caveats included
If you post it in: equipment and media come in to the secure intake lab as insured, tracked parcels, and we pay the carriage home; ring first if you would rather talk the packing through. Fuller notes sit on the postage page.

The work, stage by stage.

The full casebook →
01

A quiet briefing first, then a price in writing Free

Every instruction opens in confidence. You set out the incident, the devices and accounts it touches, and what the evidence has to establish; that settles the scope, and the scope settles the single written quote you receive before any examination starts. The scoping conversation is free.

ConfidentialOne fixed quote, in writingExactly what must be proved
02

Nothing before the blocker

The only thing the exhibit meets is a hardware blocker, and what comes through it is a sector-by-sector duplicate: E01 by default, since it carries its own checksums, or raw if that is what you want.

Hardware blocker fittedSector-by-sector duplicate
03

Hashed twice, and compared

An MD5 and a SHA-256 are computed while the image is written, then computed again from the closed file. If both pairs agree, the duplicate is demonstrably identical to the source — a matter of sums, not of judgement.

Both hash valuesVerified before work starts
04

All of it against the copy

Deleted, corrupted and encrypted material is worked on within the image, and the audit trail continues to run the whole time. Locked volumes go to Passware, where opening them is lawful and a credential or key lies within reach.

Deleted files recoveredPassware against encryption
05

Hashed, logged, ready to disclose

The point of handing over the lot — report, exhibits, source files, hash values, continuity log and the notes taken at the bench — is that a tribunal, or an expert instructed against you, can repeat the work and reach the same result.

Report and exhibitsHash values logged, custody intactStands up to scrutiny

Rules the bench works to

  • E01 audits itself — checksums and case metadata live inside the file, so a later alteration shows up the next time the image is verified.
  • An unverified hash proves nothing — the value carries weight only once it has been taken again from the finished image and both agree.
  • Contemporaneous notes, or none worth having — a log written up from memory afterwards is the first thread an opponent pulls.
  • A failing disk excuses nothing — the blocker is still fitted, the image and both hashes are still taken; the only difference is how long it all takes.

Which rules bite, and which do not: the second version of the Forensic Science Regulator's statutory Code has been enforceable since 2 October 2025, and it reaches forensic work done for criminal investigation and for proceedings in the criminal courts of England and Wales. An instruction that arises from a civil claim, an employment dispute or an insurance question falls outside its enforcement. Our method is identical either way; what we will tell you is which side of the line your case sits on.

From the casebook, lately.

MH · MHD-2026-6527ON RECORD ✓

A wiped laptop, and the quarter of an hour that decided it

A departing employee put a wiping tool across the laptop the evening before handing it back. Its own logs survived into the image, pinning the quarter of an hour it was running and naming the files it had passed over.

Dated chronology rebuiltAnalysis by day 8

Before it comes to the lab.

Do these now

  • Power it off and leave it alone
  • Write down everyone who has handled it
  • Keep the cables, the dock and any passwords
  • Tell us early if solicitors are involved

Things best not done

  • Let somebody have a quick look first
  • Run recovery software on the exhibit
  • Break a seal or open the housing
  • Wait; artefacts fade and free space gets reused

The questions people ask privately.

What must digital evidence satisfy?

Four things: material that has not changed, an examiner competent to handle it, a route from exhibit to finding that someone else can walk, and relevance. Blocked imaging, verified hashes and notes made at the bench prove the first three instead of asserting them.

Why block writes at all?

Because a physical device that passes reads and refuses writes is the only way to show, rather than assert, that the exhibit left the bench exactly as it reached it.

Can you open an encrypted volume?

Where you have lawful authority to open it and there is a credible route to the password or key, yes: Passware does that work, always against the image rather than the exhibit, with the method written down. Where no key can be reached, sound encryption does not yield, and we say so before you commit.

How does this differ from an ordinary recovery job?

Much of the bench work is the same; what differs is the scrutiny the outcome must withstand. A forensic instruction adds write blocking, verified hashes, an unbroken exhibit record and notes made while the work happens — what holds a finding together when an opposing expert starts pulling at it.

The recorder is already writing over it.

Loop recording is already writing over what you need, and the deadline will not move. Open a case today: the diagnosis costs nothing and stays confidential.

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