Data Recovery Case File · Desktop Externals & Aging Drives · The Window She Used
Drive That Slowed to a Crawl: Why the Small Files Copied
Her enquiry described the failure carefully and drew one conclusion that deserves gentle correction. "The hard drive is a magnetic disk, not an SSD. It used to be the primary drive of my home computer. It began slowing to a crawl a couple of days before it stopped working entirely. I was able to move some of my smaller files to a different drive during this time, but the rest is now inaccessible. I believe the drive is broken due to overuse — I used to access it many times per day, for years. Would it be possible to repair it, or recover and extract the data to a new drive?" She did the right thing in the window she had. And the detail she reports almost in passing — that it was the smaller files that copied — is not a coincidence. It is a description of exactly what was failing.
| Media | Magnetic hard drive, formerly a primary system drive — progressive slowdown over approximately two days followed by complete inaccessibility; smaller files successfully copied during the decline |
| Reported situation | Performance degraded progressively before failure · partial evacuation achieved, biased towards smaller files · drive now inaccessible · owner attributing failure to frequency of use |
| Fault class | Progressive media degradation — read retries escalating with the number of sectors a file spans; mechanical and surface deterioration rather than access-count wear |
| Equipment used | Atola Insight Forensic head and surface assessment · PC-3000 Express with Data Extractor prioritised imaging under per-sector timeouts · weak regions revisited on later passes · contents rebuilt from the image and verified by opening |
The decode: why file size decided it, and what actually wore out
Why the small files copied: the observation that maps her drive's condition. A file is stored across a number of sectors, and a large file spans a great many more than a small one. When a drive develops failing regions, each read that lands on one stalls while the drive retries internally — and whether a copy succeeds depends on whether it happens to cross a bad area. A small document spans few sectors and frequently clears them all. A large photograph, video or archive spans thousands and is proportionately far more likely to hit one, at which point the copy stalls and eventually fails. So the pattern she experienced — small files coming across, large ones refusing — is not arbitrary. It is the arithmetic of surface damage, and it tells us the failing regions were scattered rather than concentrated.
Why what she did was right: worth saying, because people in that position usually freeze or thrash. Recognising a window and using it to save what would fit is exactly the correct response to a drive that has started to slow. The only refinement worth offering for next time is to work in priority order rather than by what copies easily — irreplaceable things first, even the large ones, because a large file that fails can be retried later while a small unimportant one that succeeded has cost you time.
What "overuse" really means: and here her conclusion needs adjusting, because it is a very common belief and it is not how drives fail. Reading a drive does not consume it the way mileage consumes a tyre. Access frequency is a poor predictor of hard drive failure — what actually degrades is mechanical: bearings, the head assembly, the flying height, and the magnetic surface itself, which deteriorates through time, heat, vibration and manufacturing variation far more than through being read. A drive used constantly for years and one used occasionally for the same years fail at broadly comparable rates. So she has not worn it out by using it, and nothing she did caused this. It is a component that reached the end of its life, which is what they all do.
Repair or recover: her explicit question, answered as this archive always does. Recover. A drive that has degraded to this point should never be trusted with anything afterwards, and the realistic outcome is her data extracted onto media she can rely on, with this drive retired. Repairing it to working order is neither achievable in a meaningful sense nor desirable.
On the bench
The Atola Insight Forensic assessed the heads and surface directly, converting her copying experience into a measured map of where the drive still read cleanly and where it did not — the failing regions her large files had been colliding with, located rather than inferred. Imaging ran on the PC-3000 Express under Data Extractor with per-sector timeouts enforced and the sweep prioritised: the healthy expanse captured at full speed first, and the weak neighbourhoods revisited on later passes, where patient repeated reads recovered sectors that had defeated an ordinary copy entirely. The contents were rebuilt from the completed image and verified by opening before delivery on fresh media.
The outcome
The drive imaged under timeout control with the weak regions re-read, and the contents rebuilt, verified and delivered onto new media. Free assessment, one fixed written figure including VAT; where a drive has to be opened, 50% of parts and labour is payable upfront with the balance only on success — otherwise no recovery, no fee. The decode, for anyone whose drive slowed before it stopped: the pattern of what copied is diagnostic, because a large file spans thousands more sectors than a small one and is proportionately more likely to hit a failing region — so small files coming across while large ones refuse maps scattered surface damage; using the window to save what you can is exactly right, though priority order beats ease of copying; and access frequency does not wear a drive out, so a drive used many times a day has not been damaged by that. It reached the end of its life, which is a different thing.
Drive that slowed down before it stopped
If you're in that window now, copy in priority order rather than by what moves easily — the irreplaceable things first, even the large ones. A file spans more sectors the bigger it is, so large files are far more likely to cross a failing region and stall, which is why small ones often come across while big ones refuse. That pattern is telling you the damage is scattered rather than concentrated. Don't run repair utilities and don't defragment; both write heavily to a drive that is already struggling to read. And don't blame yourself for using it — access frequency isn't what wears hard drives out. What degrades is mechanical and magnetic: bearings, the head assembly, the surface itself, affected by time, heat and vibration far more than by how often you opened files. Recover onto new media and retire the drive rather than trying to repair it.
The pattern maps the damage — call Glasgow Data Recovery on 0141 404 0294; surface measured, imaged healthy-regions-first under timeouts, weak areas re-read patiently and verified out.
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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.