Data Recovery Case File · USB Flash · Liquid Damage

Rained on, powered, and left too long: recovering a dead SanDisk USB stick — and answering the three questions everyone asks

This enquiry earned its case file by asking, politely and precisely, the three questions every liquid-damage customer wants answered: is recovery possible, what will it cost, and what percentage typically comes back? The patient: a 64GB SanDisk Cruzer Blade that had been connected to a laptop when heavy rain arrived, stayed soaked for several hours before being found, and — months later — was recognised by no PC at all.

The enquiry

“My USB drive was accidentally exposed to heavy rain while connected to my laptop, and unfortunately remained soaked for several hours before I found it. It's now not recognised by any PC. Could you let me know: whether recovery is possible in this case; the estimated cost; and approximately what percentage of data is typically recoverable in such situations?”

Question one: is it possible? Almost always — because of where flash keeps its data

The two aggravating details here — powered while wet, and months before help — are genuinely the bad versions of both variables. Water on a live circuit doesn't just sit there; it conducts, shorting neighbouring signals and stressing the controller, and every damp week afterwards grows corrosion across joints and traces. By the time this stick reached us, its board-level electronics were, unsurprisingly, beyond persuasion. And yet the honest answer to his first question was still an unhesitating yes, very probably — because a flash drive's data doesn't live in any of the parts that water kills easily. It lives in the NAND memory itself: sealed silicon whose stored charge is untouched by moisture on the board around it. Rain kills receptionists; it very rarely kills the library.

The recovery — around the dead electronics, not through them

After decontamination and inspection confirmed the controller path unrecoverable, the memory was addressed directly. The NAND was accessed at chip level and read out raw on the PC-3000 Flash and Flash Extractor — a dump of everything the stick had ever been told to remember, in the controller's private dialect. Reconstruction then translated it back: heavy error-correction first (flash read at this level always arrives noisy, and a stressed device noisier still), the controller's scrambling reversed, the page and block structure established, and the translation layer rebuilt with the VNR's toolset until the raw dump resolved into the ordinary FAT32 volume the customer used to plug in. His files were extracted from it, verified by opening across each type, and delivered on a new stick — with the old one retired to a labelled bag, its recovery career complete.

Questions two and three, answered straight

Cost: chip-level flash work is priced by the engineering, not the gigabytes — a fixed quote follows the free assessment, before any work, and, where a chip has to be removed, 50% of parts and labour is payable upfront with the balance only on success; a dead-on-arrival stick costs nothing to have answered honestly. Typical percentage: when the NAND is intact — the situation in most liquid cases, this one included — recovery runs at or near complete; meaningful losses arise mainly where the chip itself was damaged or where heavy corrosion has sat unattended for very long periods. Which supplies this file's one sharp edge: the months of delay changed this from a cleaning job into a chip-level one. Wet devices keep their data patiently, but they don't keep their options patiently. Weeks are kind; seasons are 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.