Data Recovery Case File · Trust, Practice & Honest Limits · The Practicalities Nobody Explains

What You Actually Need to Supply

Her enquiry asks something practical that rarely gets answered anywhere. A 4TB drive that stopped working and now clicks: "I have tried several recovery methods myself but I have been unable to do it. I wanted to ask how much a drive of that size would cost to recover, and how I would do it. Also, would I need to provide a new drive as well? I am assuming I" would. The answer is yes, and it is simpler than she fears. But the more important thing in her message is the sentence before it — because several recovery attempts on a clicking drive is the part that has cost her something.

The decode: the practical answer, then the urgent one

Yes, you need somewhere for the data to go, and it must be a different device. Recovered data is never written back to the drive it came from — the source is preserved exactly as received, and writing to it would destroy what is being recovered. So a destination is always required, and you can either supply one or have one supplied. Either is normal.

What size it needs to be, and this is where people over-buy: the destination must hold what is recovered, not match the source drive's capacity. A 4TB drive with 600GB of photographs on it needs somewhere for 600GB. Establishing how much data is actually there is part of the assessment, so nobody should buy a matching drive before that figure is known.

How it should be formatted: according to what will read it — a Windows machine, a Mac, or both. Saying which up front avoids a delivered drive that the recipient's computer cannot open, which is a frustrating way to end an otherwise successful recovery.

What else to send with the drive: the enclosure board if it came out of a case, since some carry encryption or determine how the drive presents itself. Any password, if the drive was protected. A note of what has already been tried. And a short list of what matters most, so imaging can be sequenced to reach that first.

Now the part that matters more, said without reproach. A clicking drive is a mechanical fault: the head assembly is attempting to position, failing to find its reference, retreating and trying again. Software cannot address that — recovery applications ask the drive to read sectors, and a drive that cannot position its heads has nothing to give them. So the several methods she tried were never capable of working, which is worth knowing because it means their failure says nothing about whether the data survives.

What those attempts did cost: each one ran a damaged mechanism for as long as the scan lasted, with the heads sweeping repeatedly across surfaces they cannot read. Where a head is contacting a platter, that widens the affected area and generates debris that circulates and causes more. This is not said to make her feel bad — it is what everybody does, because trying to get your own files back is the obvious response. It is said because the number of further attempts is the one variable still in her hands, and it should now be zero.

On the bench

The drive was not powered again, since a clicking mechanism damages surfaces with every attempt and several scans had already been run. It was opened under the laminar flow bench and the head assembly, platter surfaces and spindle inspected before any spin attempt, with attention to debris generated during the earlier attempts. Matched donor parts were fitted as indicated, and imaging ran to separate destination media in one supervised session — the recovered volume of data established before destination sizing, since a destination need only hold what is recovered rather than match the source.

The outcome

The mechanism inspected before power, serviced and imaged to separate media in one supervised session. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on successful recovery. The decode, and the practical answer: yes, a destination device is needed, because recovered data is never written back to the source — but it only needs to hold what is actually recovered, not match the drive's capacity, so wait for that figure before buying anything. Say which system will read it. And stop running recovery software on a clicking drive: it is a mechanical fault that software cannot reach, and each scan sweeps damaged heads across the surfaces again.

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.