DIY Data Recovery Software: When It Can Destroy Evidence and What to Do Instead

A practical guide to deleted-data recovery, evidence preservation, SSDs, smartphones and when forensic acquisition should come first.

ORIGINAL PUBLICATION: 30 July 2018  REVISION COMPLETED: 18 September 2026 AEST

By: Claude Khoury, Chief Operating Officer, NSI Global

If deleted data is important, difficult to replace or potentially evidence, the safest first action is usually not to install recovery software, update the operating system, factory-reset the device or keep using it normally. Every additional action can change storage, metadata, logs or other artefacts that may matter to recovery and forensic interpretation. The risk is not that all data-recovery software is inherently unsafe. The risk is using the wrong recovery method on the original device before the storage technology, evidence requirements and device state have been assessed.

This article was first published in 2018 with a simple warning: do not overwrite the data you are trying to recover. That principle remains sound, but the technology has changed. Modern SSDs, encrypted smartphones, cloud synchronisation and forensic acquisition methods require a more precise rule: preserve the source first when the value of the data or the evidentiary stakes justify it.

Should You Use DIY Data Recovery Software?

Sometimes — but only when the consequences of failure are genuinely acceptable and the recovery method will not write to, alter or further damage the source you are trying to preserve.

That decision should not be based solely on whether the data has legal or evidentiary value. Some information may be personally, academically or commercially irreplaceable even though it will never be used in court. A deleted university thesis, years of small-business records, the only photographs or videos of a deceased loved one, family archives, creative work, research data, financial records or other unique files may justify the same cautious approach as formal evidence because there may be no second opportunity if recovery attempts make the situation worse.

Recovering a replaceable personal file from a non-evidentiary device is therefore a very different problem from attempting to recover unique or sentimental data, reconstruct business records, retrieve deleted messages for litigation, investigate employee misconduct, preserve evidence after fraud, or examine a phone that may contain time-sensitive artefacts.

Before using DIY recovery software, the more useful question is not simply “Can I run a recovery program?” It is “What would happen if this attempt reduced the remaining recoverability of the data?” If the answer is that the loss would be financially significant, personally devastating, academically damaging or impossible to recreate, professional assessment should be considered before experimenting with the original device or storage medium.

Where the data may also matter to a court, regulator, insurer, employer, investigation or dispute, the threshold for caution is even higher. Recovery should begin with preservation and acquisition planning rather than trial-and-error repair. The objective is not simply to get a file back. It is to retain enough integrity and provenance to explain what was recovered, where it came from, what changed during collection, and what the result does — and does not — prove.

Why Deleted Data Is Not Simply Sitting There Waiting to Be Recovered

Deletion does not behave the same way on every device. On some storage media, deleting a file removes or changes file-system references while portions of the underlying content may remain until those storage locations are reused. On other systems, encryption, flash-management processes, TRIM, garbage collection, application databases or cloud synchronisation can make deleted content unavailable much sooner or leave only fragments and metadata behind.

What DIY Recovery Attempts Can Change

Consumer recovery utilities are designed to solve a problem, not necessarily to preserve an evidentiary record. Depending on how and where they are used, recovery attempts may write new files, create caches, modify timestamps, install drivers or helper components, update databases, generate logs, mount volumes differently or prompt an operating-system update. Normal device use can also continue writing to storage in the background.

That does not mean every recovery application destroys every deleted file. It means that when the original source matters, changes should be minimised and documented. Current forensic acquisition guidance recognises both hardware and software methods; the defining issue is whether the acquisition process is appropriate, validated and controlled for the device and purpose.

Five Things Not to Do Before a Forensic Data-Recovery Assessment

1. Do Not Install Random Recovery Utilities on the Affected Storage

Installing software on the same drive or device can create new data and change the very source from which deleted artefacts may need to be recovered.

2. Do Not Factory-Reset, Reimage or Restore the Device

A reset or restore may remove active data, logs, application artefacts, identifiers and other information needed to reconstruct what happened.

3. Do Not Update the Operating System Merely to Run a Recovery Tool

Updates can modify large volumes of storage and alter the environment an examiner needs to interpret. Security updates may be necessary in an active cyber incident, but evidence preservation and containment priorities should be considered together.

4. Do Not Keep Using the Device Unnecessarily

Taking photos, downloading files, browsing, messaging, installing apps and normal background activity can all create new writes and rotate logs or temporary data.

5. Do Not Assume a Failed DIY Attempt Means the Data Is Gone

A consumer tool may fail because it cannot access the relevant storage layer, database, encrypted artefacts or fragmented data. Failure of one tool is not a forensic conclusion.

Smartphones Need Different Handling From Hard Drives

Mobile devices are dynamic evidence sources. Current SWGDE guidance notes that there is no traditional write-blocking method for the mobile device itself. A forensic acquisition may require communication with the handset and, in some circumstances, advanced extraction techniques can leave artefacts that must be contemporaneously documented. A single forensic tool may also fail to extract or interpret all available data, which is why corroboration and multiple validated methods can be necessary.

Power state can also matter. Modern phones may initiate additional security measures after a restart or power loss, while leaving a device connected to networks can expose it to new messages, synchronisation or remote actions. For an unlocked or potentially evidential phone, the safest public advice is therefore not a universal ‘turn it off’ rule. It is to stop unnecessary interaction and obtain forensic advice before changing the device state.

Why SSDs and Flash Storage Change the Recovery Equation

Solid-state storage does not behave like a traditional magnetic hard disk. SSDs, NVMe devices and other NAND-based media use controller-level processes such as wear levelling and garbage collection. Operating systems may also issue TRIM commands identifying blocks that are no longer required. As a result, deleted data that appears theoretically recoverable at the file-system level may no longer be available through conventional acquisition.

There is no honest universal recovery percentage. Recoverability depends on the device, controller, operating system, encryption, deletion method, TRIM behaviour, subsequent use, physical condition and acquisition technique. Any provider that guarantees recovery before assessing those variables is simplifying a complex problem.

Damaged Drives: Stop Repeated Repair Attempts

When a hard drive, SSD, NVMe device, USB storage device or memory card is physically failing, the priority changes again. Current SWGDE guidance warns that traditional forensic imaging of a failing drive can, in some circumstances, cause evidentiary data to be destroyed. Repeated power cycles, repair utilities, file-system checks or attempts to open a drive outside an appropriate recovery environment may make the situation worse.

A damaged-media case should therefore be triaged for the type of failure before routine acquisition or repair. Physical recovery, forensic acquisition and logical recovery are related disciplines, but they are not interchangeable.

Personal File Recovery and Digital Evidence Are Different Jobs

The right level of care depends on what is at stake. If you accidentally deleted a copy of a replaceable personal document, you may reasonably accept a degree of risk in attempting a consumer recovery method. If the device may contain evidence, the priorities change.

Forensic Acquisition Comes Before Analysis When Evidence Matters

Professional digital forensics is not defined by avoiding software. Modern forensic practice uses validated hardware, software, acquisition configurations and write-protection controls appropriate to the source. For conventional computer storage, recognised best practice is to minimise changes to source data and use hardware or software write-blocking where possible. Acquired data is then verified and documented, including cryptographic hashing and chain-of-custody information.

The important distinction is between controlled forensic acquisition and ad-hoc recovery on the source. Examiners should be able to explain the acquisition method, tool versions, errors, device state, hash values where applicable, and any unavoidable changes made during collection.

When Automated Recovery Is Not Enough

Many recoveries are straightforward once a defensible acquisition has been obtained. Others are not. Deleted content may survive only as fragments, database records, metadata, unallocated data, slack space, application caches, backups, synchronised copies or remnants that a standard parser does not reconstruct automatically.

In complex matters, NSI Global can perform deeper artefact and binary-level analysis to identify fragments and relationships that automated recovery may miss. The familiar ‘10,000-piece jigsaw puzzle’ analogy still applies: fragments may exist without the original file structure or context that would normally tell software how they fit together. In those cases, examiner experience, corroboration and manual analysis can become critical.

Deep analysis is not a promise that every deleted file can be reconstructed. Where content has been genuinely overwritten, cryptographically rendered inaccessible or removed by storage-management processes, no tool can reliably recreate the original data from nothing.

NSI Global’s Nine-Stage DFIR-EDM Methodology

Where deleted data is part of a legal, corporate, cyber or investigative matter, NSI Global applies a structured Nine-Stage Digital Forensic Incident Response and Electronic Discovery Model (DFIR-EDM). The methodology is designed to preserve evidence integrity and maintain a defensible record from instruction through reporting.

How NSI Global Approaches Deleted Data Recovery

NSI Global’s Digital Forensic Unit has more than two decades of experience in deleted-data and digital-evidence matters. The current service capability covers more than 40,000 mobile device types and extends across smartphones, tablets, computers, storage media, smart watches and relevant cloud or account sources where lawful authority exists.

The appropriate recovery method depends on the source. NSI Global uses restricted-access forensic equipment and professional forensic software where appropriate rather than forcing every device through one recovery workflow. The objective is to preserve the best available evidence, acquire data using a technically appropriate method, analyse from forensic copies or controlled acquisitions, and document findings in a form suitable for the client’s purpose.

Where a matter is intended for litigation, regulatory review, employment action, insurance or another formal process, recovery is integrated with chain-of-custody documentation, hashing where applicable, expert reporting and the ability to explain methodology and limitations under scrutiny.

Related NSI Global resources: Digital Forensic Data Recovery | Digital Forensics | Digital Forensic Incident Response | What Is Digital Forensic Data Recovery?

Can Recovered Digital Evidence Be Used in Court?

Recovery alone does not determine whether digital material will be admitted or how much weight a court will give it. That depends on the circumstances, applicable evidentiary rules and the purpose for which the material is tendered. Forensic acquisition, hashing, chain-of-custody documentation, repeatable methods and clear expert reporting can materially strengthen the ability to demonstrate integrity, provenance and reliability.

This is another reason not to treat an evidential matter as a simple file-recovery job. A recovered screenshot or exported message may be useful, but a defensible forensic record can provide much more context about source, timestamps, metadata, application data and the process used to obtain it.

Frequently Asked Questions

Can Data Recovery Software Permanently Overwrite Deleted Files?

It can reduce recovery options if it writes new data to the same storage locations or triggers other changes to the source. The outcome depends on the device, storage architecture and how the software operates. The safest approach for valuable or evidential data is to preserve the source before experimenting.

Should I Install Recovery Software on the Same Drive?

Not when the data is valuable or potentially evidential. Installing applications creates new writes. For conventional storage, recovery or examination should preferably occur from a forensic image, clone or otherwise controlled source rather than by installing tools onto the affected media.

Can Deleted Files Be Recovered From an SSD?

Sometimes, but SSD recovery is affected by TRIM, garbage collection, wear levelling, encryption, controller behaviour and subsequent use. Deleted content can become unavailable even when a user has not intentionally overwritten it.

Can Deleted Text Messages Be Recovered From an iPhone or Android Phone?

In some cases, relevant message content, databases, attachments, metadata, backups or synchronised artefacts may still be available. Recovery depends on the phone model, operating system, application, encryption, deletion method, time elapsed and subsequent activity.

Should I Turn Off a Phone After Deleting Important Data?

There is no universal answer for an evidential smartphone. Powering off can stop some ongoing changes, but a restart can also trigger stronger security states and affect data accessibility. Stop unnecessary interaction and obtain specialist advice before changing the state of an unlocked or potentially evidential device.

Does a Factory Reset Make Data Unrecoverable?

A modern factory reset can severely limit recovery, particularly on encrypted devices, but the forensic answer depends on the device and the data source. Related artefacts may also exist in cloud services, backups, synchronised devices or provider records.

Can Overwritten Data Be Recovered?

If the same physical storage locations have truly been overwritten, the original content is generally not recoverable through ordinary forensic methods. However, ‘deleted’, ‘missing’ and ‘overwritten’ are often used interchangeably by non-specialists, so assessment is required before concluding that evidence is gone.

Is Digital Forensic Recovery Different From Normal Data Recovery?

Yes. Standard data recovery focuses on retrieving usable files. Digital forensic recovery also considers preservation, provenance, acquisition method, hashing, chain of custody, repeatability, metadata, context and reporting where the material may be used in an investigation or formal proceeding.

What to Do Now If the Data Matters

If important data has been deleted or a device has failed, stop unnecessary use and avoid making changes simply to see whether the data comes back. Record what happened, when it happened and what actions have already been taken. If the device may contain legal, corporate, employment, regulatory, insurance or investigative evidence, preserve it and obtain forensic advice before recovery, repair or reset attempts.

For urgent matters, contact NSI Global from a separate trusted device or environment so the preservation and acquisition strategy can be considered before further evidence is altered.

Sources and Further Reading

1. Scientific Working Group on Digital Evidence (SWGDE) – Best Practices for Computer Forensic Acquisition (17-F-002-2.1)
2. SWGDE – Best Practices for Mobile Device Evidence Collection & Preservation, Handling and Acquisition (18-F-003-2.0)
3. SWGDE – Best Practices for Digital Evidence Collection (18-F-002-2.0)
4. SWGDE – Best Practices for Handling Damaged Digital Storage Devices (14-F-002-2.0)
5. NIST – Digital Evidence Preservation: Considerations for Evidence Handlers
6. NSI Global – Digital Forensic Data Recovery
7. NSI Global – Digital Forensic Incident Response