Devices · USB sticks & flash drives
Important things land on memory sticks by accident: the accounts nobody copied anywhere else, a stopgap backup now in its third year. Snap the plug, kill the controller, and the flash inside generally survives both. That chip is where we start, and stick work keeps this Milton Keynes bench busy.
Run the problem past an engineer
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| What appears | What's behind it | First move |
|---|---|---|
| Unknown USB Device (Device Descriptor Request Failed) — Code 43 | Nothing comes back from the stick — the controller has stopped | Stop working through your USB ports |
| USB device not recognized | The controller never introduces itself | One try in a second port, then leave it |
| You need to format the disk in drive X: | A broken file system sitting over sound data | Formatting is the wrong answer |
| Please insert a disk into removable disk (0 bytes) | The controller has lost its grip on the NAND | Bench work at chip level |
| Error 0x80070570: file or directory is corrupted and unreadable | Damage in the FAT or exFAT structures | Fixable — write nothing else to it |
| Windows was unable to complete the format | The controller has gone for good | Just as well it refused |
Every item gets its own case number on the day it lands here. An engineer traces the fault, gives you a plain assessment of what is realistically recoverable, and puts one fixed price in writing. The diagnosis is free, you are under no obligation, and chargeable work starts only when you say go.
An older stick lets its NAND package come off the board to be read alone. On a monolith, memory and controller are moulded as one, so the read goes through test pads a fraction of a millimetre wide.
Controllers move blocks about for wear levelling, interleave them across planes and scramble the result for good measure. Each of those steps is unwound in software until real files show up.
You see the list of recovered files and approve it before any fee exists, and it all comes back on fresh media.
You get the full list of recovered files first, and nothing is charged until you approve it. Data goes back on fresh media, return postage paid, and the job stays open on our side until you confirm every file opens at your end.
Straight talk on the odds: there are no trustworthy public failure figures for consumer flash — nobody runs fleets of memory sticks and publishes numbers as they do for hard drives. Our own intake shows this: broken connectors account for most of the physical injuries, and sticks that die without warning are overwhelmingly unbranded or promotional.
Someone stood on it in a site office and the connector tore off entirely. A monolith, so the read had to happen at the test pads once we had mapped the controller pinout ourselves. The tax return went in on time, with seven years of invoices and CIS records behind it.
Nearly always. A connector is just a connector; your files live in the NAND chip further down the board. Even a stick in two pieces will usually still read, provided the chip itself — or the monolith wafer — has not cracked.
No. What's gone silent is the controller, not the memory. Read the NAND directly and the controller stops mattering.
Cheap sticks put poor flash behind a weak controller, and a few are plain fraudulent about size — a small chip reported as a large one, which holds up until you write past the real limit. Fine for carrying a film around; never the only copy of anything.
There's really only one dead end: a memory die split right through. Dead controllers, broken boards, mangled translation tables — all of that is standard chip-level work.
Switch a failing device on again and you lose a little more. Open a case before you do — the diagnosis is free, whatever it finds.