Data Migration Verification

Migrations Lose and Corrupt Files Silently

Moving data between servers, drives, clouds or systems almost never throws a loud error when something goes wrong. A copy job times out on a handful of files, a network blip truncates a transfer, an encoding setting rewrites a document, or a folder simply does not make it across — and the migration log still reports "done." Weeks later someone opens a file that will not parse, and there is no clean way to tell whether the damage happened during the move or after it. The only reliable defence is to verify the destination against the source at the byte level, before anyone signs off.

A Simple Pre / Post Hash Comparison Workflow

e-Dex turns verification into three steps. First, point it at the source and compute a cryptographic hash for every file — that is your pre-migration baseline. Second, run the migration as usual. Third, hash the destination the same way and let e-Dex compare the two sets. A hash is a fixed-length fingerprint of a file's exact contents, so if a single byte changed in transit, the comparison catches it. e-Dex computes strong modern algorithms — SHA-256, SHA-512 and BLAKE3 — alongside MD5 and SHA-1 for matching against any values your source system already recorded.

Spot Mismatches Before Sign-Off

The comparison sorts every file into three clear buckets. Matched files have an identical hash on both sides — they moved perfectly and need no further attention. Changed files have a different hash on the destination, meaning the content was altered or corrupted during the move. Missing files exist in the source but never arrived. You see all three at a glance, so you can re-copy the handful that failed instead of either trusting the whole batch blindly or re-running an entire multi-terabyte migration on a hunch.

Generate a Data Migration Verification Certificate

Once the comparison is clean, e-Dex produces a Data Migration Verification Certificate: a one-page, readable record of what was checked, which algorithms were used, the per-file results and an overall verdict. It is the artefact you attach to a cutover ticket, hand to an auditor, or file alongside a change record to show the move was lossless and verified. For the full background on the document itself, see our guide to the data migration verification certificate. You can later confirm any certificate has not been tampered with on the verify a certificate page.

Built for Migration, Cloud, ERP/CRM and Ops Teams

Anyone responsible for "the data is all there and intact" benefits from a verified move. Migration teams use it as the final gate before cutover. Cloud and infrastructure teams verify lift-and-shift moves and backup restores. ERP and CRM teams confirm master data, documents and attachments survived a system upgrade or platform switch. IT operations and managed-service providers issue the certificate to clients as proof of a clean handover. Because e-Dex runs fully offline on a single Windows machine, sensitive datasets never leave your environment, which matters for finance, healthcare and government workloads.

Frequently Asked Questions

What is a data migration verification tool?
A data migration verification tool computes a cryptographic hash for every file before a migration and again after it, then compares the two sets. If the hashes match, the files are bit-for-bit identical and the move was lossless. If they differ, or a file is missing on the destination, the tool flags it so you can fix the problem before sign-off. e-Dex does this fully offline on Windows.

Does e-Dex need an internet connection to verify a migration?
No. e-Dex runs entirely offline on your own Windows machine. Hashing the source, hashing the destination, comparing the values and generating the Data Migration Verification Certificate all happen locally, so your data never leaves your environment.

How does e-Dex spot files that changed or went missing during migration?
e-Dex matches each post-migration file to its pre-migration hash. A file whose hash is identical is reported as matched, a file whose hash differs is reported as changed or corrupted, and a file present in the source but absent in the destination is reported as missing. You see all three categories before you sign off.

Is e-Dex really free?
Yes. e-Dex is free to download and use for Windows. It is built by Innovativa SoftTech in Pune as the Digital Evidence Integrity Suite, and the same hashing engine powers its data migration verification workflow.

Verify Your Next Migration with Confidence

Do not let a silent copy failure surface months after cutover. Hash before, hash after, compare, and certify — in minutes, offline, on a single Windows machine with e-Dex, the free Digital Evidence Integrity Suite. Download it free and prove every file survived the migration intact.