Data Recovery Case File · Desktop Externals & Aging Drives · Stop the Copy
Hierarchy Visible, Copy Failing, and a Noise From the Drive
His enquiry combined two observations that individually would point in different directions and together settle the matter. A 1TB internal Mac drive: "gone down. File hierarchy visible when Mac disk utilities are engaged, but data can't be copied from disk to back-up. Drive makes possible armature stuck noise." The first half describes a pattern this archive sees constantly — a perfect file listing over content that will not come across — and on its own it is a patient problem worked with careful imaging. The second half changes that completely. A mechanical noise means every failed copy attempt is costing him physically, not just in time, and it turns a job that could wait into one that should not.
| Media | 1TB internal Mac hard drive — folder hierarchy readable through disk utilities; file copying fails; audible mechanical noise consistent with actuator or head trouble |
| Reported situation | Directory structure visible and apparently intact · copy operations to a backup failing · abnormal mechanical sound during operation · repeated attempts made |
| Fault class | Readable metadata over unreadable content, with active mechanical fault — head or actuator trouble making continued access physically damaging |
| Equipment used | Copy attempts halted · laminar flow bench inspection of heads and surfaces before further power · matched donor head service as indicated · PC-3000 Express with Data Extractor prioritised head-mapped imaging · losses reported per file |
The decode: the familiar split, and why the noise changes everything
Why the listing works and the copying does not: a filesystem's directory — the folder tree, filenames, sizes and dates — is small and stored in a concentrated area. File contents are spread across the whole surface. Those are two different reads from two different parts of the disk. If the concentrated region still reads and the wider surface does not, a disk utility displays a complete and accurate hierarchy while every attempt to fetch an actual file fails. The listing is not misleading him; it is reporting what it successfully read.
Why the noise transforms the case: and this is the point of the page. When that split occurs on a quiet drive, it usually indicates media defects — failing sectors — and the correct response is patient imaging under timeout control, with weak regions revisited on later passes. Nothing is being destroyed while that is arranged. But a mechanical noise means the mechanism itself is in trouble: an actuator struggling, heads failing to position, or worse. His own phrase — a stuck arm — is a reasonable lay description of exactly that. And a struggling mechanism does not merely fail to read; it deteriorates while running. Each copy attempt sends damaged or misaligned heads travelling across surfaces holding his data, and if any contact is occurring, the damaged area grows every second.
Why the copy attempts are the worst thing available: because they are prolonged. A copy operation does not fail quickly — the operating system waits, retries, and keeps the drive working for as long as it takes to give up, which on a stalling drive can be minutes per file. So an afternoon spent trying to copy files off is an afternoon of a damaged mechanism running continuously across the very regions that are failing. The instinct is entirely reasonable and it is the most expensive thing he can do.
What happens instead: the drive is not powered again casually. It is inspected before further power, because on a mechanical fault the condition of the heads and surfaces determines the plan rather than following it. Where servicing is required it is done, and imaging then runs prioritised and head-mapped — the readable expanse captured completely first, damaged zones deferred — in one supervised session rather than across repeated attempts. And because the directory region reads, the folder structure and filenames can be recovered too, so his data comes back organised rather than as a flat carve.
On the bench
The copying stopped, which was the single most valuable step available. The drive was not powered again casually: it was opened under the laminar flow bench and the head assembly and platter surfaces inspected before anything else, with any scoring located and measured — the inspection deciding the plan rather than following one. Matched donor parts were fitted where the finding required them, and imaging ran on the PC-3000 Express under Data Extractor, head-mapped and prioritised, in one supervised session. The directory structure was recovered alongside the content so that the delivered set carried its original folders and filenames, and any unreadable regions were resolved to the specific files they affected.
The outcome
The mechanism inspected and serviced, the drive imaged in one supervised session, and the contents delivered with folders and filenames intact and losses named per file. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on successful recovery. The decode, for anyone in this position: a perfect folder listing over files that will not copy means the small concentrated directory region reads while the spread content does not — which on a quiet drive is a patient problem; but a mechanical noise changes it entirely, because a struggling mechanism deteriorates while it runs, and copy attempts are prolonged rather than quick, so an afternoon of trying is an afternoon of damaged heads crossing your data. Stop the copy, leave it off, and have the surfaces looked at before any further power.
Files listed but not copying, and the drive is making a noise
Stop copying immediately and switch it off. Those two symptoms together are more urgent than either alone. A full folder listing over files that won't copy tells you the small directory area still reads while the spread-out file content doesn't — on a silent drive that's a patient problem. A mechanical noise tells you the mechanism itself is struggling, and a struggling mechanism gets worse while it runs. Copy attempts are the worst possible combination, because they don't fail quickly: your computer waits and retries, keeping a damaged drive working for minutes per file, across exactly the regions that are failing. Don't try a different cable or another computer, don't run repair utilities, and don't leave it connected hoping something completes. Keep it flat and still. The good news is that the readable directory usually means your folders and filenames can come back too.
Stop the copy now — call Glasgow Data Recovery on 0141 404 0294; surfaces inspected before further power, serviced with matched donor parts, imaged in one session with folders preserved.
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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.