Memory cards · case notes · MKD-2025-4911
Two Clear Nights Under a Dark Sky.
A year of waiting on the weather had produced two clear nights at a dark-sky site in Northumberland
, and the card came home holding all of it. Then a tight reader in Luton refused to give it up. He worked a screwdriver in, the card yielded before the slot did, and a piece of the plastic snapped off next to the gold strips
. The fragment went under the workbench and stayed there. After that no reader would even register a card
.
Same fault? Start here.
0800 6890668
Without the jargon.
An SD card is mostly packaging. The part that works is one moulded die, controller and memory cast together, joined to the gold pads by traces running close to the corner he broke off. Break that corner and what usually goes is the wiring, not the storage: the letterbox has gone while the post sits safely indoors. Losing the fragment felt like the end of the world to him and made no difference at all to us. A fracture tells you plenty under a lens, and this break had used up its energy well before it got anywhere near the die.
The kit this job needed.
See how a job runs here →| Kit | Why it was used | What it gives us |
|---|---|---|
| Rusolut Visual NAND Reconstructor | Turned the raw dump into ordered pages, the ECC corrected | Takes a raw flash dump to readable files: ECC, XOR, page order, reassembly |
| IR preheater & BGA rework station | Measured, gentle heat to clear coating off the test pads without cooking the memory | Removes NAND from the board and reballs it, with the data kept clear of the heat |
| PC-3000 Flash | Matched the monolith to its library entry and fixed the pinout before any power | Pulls data straight off the flash chips, matching each part to a constantly updated ID library |
What happened on the bench.
Study the fracture before anything else
With no fragment to compare against, the card had to give evidence itself. Under the stereo microscope the account was clear: a bite missing from the contact block, severed traces where it had sat, and the crack running out of energy well short of the die. On that showing, an alarming card became an ordinary chip job.
Go in by the service pads instead
A monolith has service pads underneath, meant for the factory and for nobody else, and every manufacturer arranges them differently. There is no published map. This one was charted by probing. Hair-fine wires went onto the pads that mattered, and the memory replied along a path the break had never come near.
Turn what the chip gives you into files
A chip does not hand back photographs. It hands back pages of data in whatever order the controller happened to use. Error correction runs first, then the XOR pattern and the page sequence are unpicked, and only once a filesystem is rebuilt on top of that do folders and filenames return. That gap is why a broken card is bench work, not reader work.
The outcome.
Both nights came back whole, every light frame opened and looked at, the calibration files included. The card itself is finished, which no longer troubles him.
Other jobs from the casebook.
Also on the Memory cards shelf.
Does that sound like your device?
One lesson runs through the lot: cut the power, let us look for free, then decide with the facts in hand.