Data Recovery Case File · Desktop Externals & Aging Drives · Reading Two Different Amounts

Listing a Directory Reads Kilobytes and Copying a File Reads Everything It Contains

His enquiry separates two behaviours that people usually report as one fault. An old internal drive holding archives held nowhere else, taken from a machine unused for years and connected through a caddy, where "I can see the file structure but whenever I try and copy anything the drive freezes." Those are different demands on the same drive, and the gap between them is the diagnosis rather than an inconsistency.

The decode: why the two behaviours differ, and what years of storage contribute

What listing a directory actually reads: very little. Structures describing an entire folder occupy kilobytes and sit in one place, so a listing is a short read of a small region.

What copying a file demands instead: everything in it. Every sector the file occupies must be read successfully, and a large file spans a wide area of the surface.

Why that difference produces exactly what he describes: the small read succeeds. A drive whose structures sit in a healthy region lists perfectly while its content regions cannot be traversed.

Why the drive freezes rather than reporting an error: it is retrying. A sector that does not read is attempted repeatedly, and the operating system waits without any imposed limit.

Why that appearance of a freeze is misleading: the drive is working hard. Nothing has stopped — it is repositioning heads and re-reading, and the host has nothing to display while it does.

Why cancelling and retrying is the worst pattern: nothing accumulates. Each cancelled copy abandons the file, so repeated attempts spend the drive's working life reaching the same point and stopping.

Now the years of storage, which is a real factor: drives do not like standing. Lubricant migrates, and heads resting against surfaces for long periods can leave residue.

Why that particularly affects a first use after long idleness: the first spin-up is the hardest. A drive returning to service after years faces its greatest mechanical demand at the moment it starts.

Why he has nonetheless already had the best of it: it started and listed. A drive that spun up and returned its structures has passed the difficult moment.

What must happen now: no more copy attempts. The listing has already told him what is there, and every further attempt is spent on the regions least able to bear it.

On the bench

Listing success was distinguished from transfer success as differing read demands — directory structures for a whole folder occupying kilobytes in one place, so a listing is a short read of a small region, while copying requires every sector a file occupies across a wide area. Apparent freezing is sustained retrying without an imposed limit rather than a stopped drive. Long idle storage makes the first spin-up the greatest mechanical demand. Healthy regions were captured first.

The outcome

Listing distinguished from transfer as differing demands, copying through the host stopped, and healthy regions captured first under capped timeouts. Free assessment, one fixed written figure including VAT, 50% of parts and labour upfront with the balance only on successful recovery where the drive is opened. The decode: the two behaviours are one finding. A listing reads kilobytes from one place and a copy reads every sector a file occupies — so your structures are in a good region and your content is not.

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.