SDC / Whatever it is saying now / Card not recognised, or not showing up

not recognised · not showing up · not detected · Windows 11 · Mac · Disk Management · no media · adapter · reader · controller

Card not recognised, or not showing up. The reader, the adapter, the slot, or the card. Two minutes tells you which.

A card that does not show up at all is the most frightening message because it is no message: the camera says no card, the computer shows nothing, Disk Management shows nothing or a device with no media. It is also, more often than any other symptom, not the card's fault. SD adapters wear out and fail; laptop slots and cheap readers stop reading UHS-II cards or large cards; a Windows machine will not show an ext4 card from a Steam Deck and an old Mac will not mount exFAT; a bent pin in a CompactFlash slot stops every card. Two minutes with a known-good reader on a known-good machine separates those from a card whose controller has stopped answering, and the controller stopping is the real version of this fault. The flash behind a dead controller is intact. On a card with chips on a board it is read by removing the chips; on a microSD, and most modern SD cards, it is read through the card's own test pads with needle adapters, and the scrambled dump rebuilt in software. A card a reader does see is £149 + VAT after the free look; a card none does is monolith work at £299 + VAT, fixed in writing either way.

Free first lookOne fixed figure in writingNo data, no bill on most jobsReturn postage paid

Rather talk it through? An engineer answers the bench line
0800 6890668

Take the card out and leave it out. Do not format it, however politely the computer or the camera asks. Do not run chkdsk, First Aid, a repair tool or a recovery program that offers to fix the card. Do not keep trying it in reader after reader, and do not put it back in the camera to see. A card that reads a little tonight may not read at all tomorrow; whatever is on it is recovered from an image, and the image comes first.

How to tell the reader from the card, and what the bench does when it is the card.

Start with what is between the card and the computer. A microSD in an SD adapter has two sets of contacts and a plastic switch that lies; try it without the adapter in a reader with a microSD slot. A full-size card in a laptop's built-in slot may be meeting a slot that does not do UHS-II, or does not do SDXC at all on an older machine; try a current USB reader. A Mac that refuses to mount a card may be refusing exFAT on an old system or ext4 from a games console; look in Disk Utility, where the device appears even when the volume does not. A card the camera reads and the computer does not is a reader or a file-system problem, not a card problem, and the camera's USB connection will often copy the files out itself. One good reader on one good machine is enough. Twenty readers is not more information; it is twenty more chances for a weak card to lose a block.

Then look at what the computer does see. On Windows, Disk Management or Device Manager will show one of three things. Nothing at all means the card drew no current and answered nothing: a dead controller, a short, or a card so cracked its contacts are gone. A device with no media, or 0 bytes, means the controller is alive and answered the host but cannot find its own translation table in the flash, which is the same fault in a less final form. A device with a capacity, and a volume Windows cannot read, is the format message, and a different page. On a Mac, Disk Utility shows the same three states, with a device greyed out where Windows would say no media.

When it is the card, the data has not gone anywhere. The flash chips hold what they held; it is the controller, the small processor that answered the computer's questions and translated addresses into flash locations, that has stopped. On a CompactFlash card and an older or larger SD card, the flash is in separate chips on a small board, and they are desoldered and read on a programmer. On a microSD, and on most modern SD cards and small USB sticks, the controller and the flash are one sealed block, and the flash is reached through the test pads the factory used, under the coating on the back: pads identified against a pinout database or by probing, a needle adapter fitted, the raw flash read out. Either way the dump is scrambled, has error-correction data interleaved, and is laid out in the controller's own page and block order, and the bench's software undoes each of those to rebuild the card as the computer would have seen it. How a memory card is recovered, from the reader to the monolith goes through it step by step.

Two things are worth knowing before you send it. A card that was not seen because its contacts were dirty or corroded, after a swim or a washing machine, is cleaned and read, and is the lower band. And a card that has been through many readers and phones in the hope that one would see it may have been powered and failed thirty times, each one a chance for the controller to write a bad block to its own table; the card that was tried once and sent is in better shape than the card that was tried everywhere.

What it says, and what it means.

Describe yours to us →

What you see	The usual reason	Where that leaves you
Nothing in any reader or device	Controller dead, or a short	Chip-off, or test pads on a monolith
Device shown, no media or 0 bytes	Controller alive, table lost	The same work; the controller's table rebuilt in software
Reads in one reader, not another	The reader, the adapter, or UHS-II	Nothing wrong with the card; copy it
Reads in the camera, not the computer	exFAT, ext4, or the reader	Copy from the camera over USB, or read on the bench
Not seen after a swim or a wash	Corroded contacts	Cleaned, dried, read; lower band
Not seen after a bend or a snap	Package or pads broken	Read through the surviving pads if the die is whole

From the envelope arriving to your files going back.

Work we have closed →

Logged the day it lands, and the first look costs nothing Free

A case number goes on the envelope and a number on the card the day it is opened, with both sides photographed. The card goes into a reader on a hardware imager that controls how long each read may take, never a laptop slot, and what it presents is read first: its capacity, its identity registers, its file system. That decides whether it is a card a reader can see with a fault in the data, or a card whose controller has stopped, and which band it falls in. The first look is free, and you can stop there owing nothing.

Nothing to pay for lookingA single figure, put in writingNo formats, no repairs, nothing written

Imaged, sector by sector, before anything else

A card that answers at all is imaged in full on hardware that limits every read and retries on its own terms, weak areas last, with a map kept of what could not be read. A card that is slow, that drops out, or that has locked itself read-only is imaged the same way, in short passes with the power cycled between them. Nothing is written to the card at any stage, and every later step happens on the image.

Sector by sector, weak areas lastNothing written to the card

The flash read through the test pads when the controller has stopped

A card no reader sees is a monolith job. The coating is removed to expose the internal test pads, the pinout is matched against a database or mapped by hand, a needle adapter is fitted, and the raw flash is read out around the dead controller. The scrambling, the error-correction layout and the page and block order are then solved in software, and a virtual image of the card assembled from the raw dump.

Pinout, needles, raw dumpDescrambled and reassembled in software

The file system rebuilt, or the files carved, on the image

On the image, the FAT or exFAT tables are rebuilt where they are damaged and read where they are not, deleted entries are brought back, and where the tables are gone the photographs and video are carved out by their own signatures. Video files cut short by a dead battery are rebuilt from a reference clip from the same camera. Every photograph is opened before it goes on the list; a file that will not open is not counted.

Tables rebuilt, or files carvedEvery file opened before it is listed

You see the file list before you pay

What was recovered is listed for you first, and only then does a bill exist. Approve the list and it is invoiced; turn it down and it is not, and where nothing has come back, most jobs carry no charge at all. The files go home on fresh media with the card, tracked, with the postage paid here, and your case stays open until you have opened them yourself.

No charge until you accept the figureFresh media, supplied with the job3–5 days at the bench

From the bench

Say which readers and machines were tried, and what each showed. Nothing, no media, or a volume it could not read are three different faults.
Send the adapter only if the card has only ever been used in one. Otherwise it stays; it is the commonest cause.
Say what the card came out of. A Steam Deck's card is ext4 and nothing is wrong with it.

1 in 3 cards that arrive here were formatted, repaired or rescanned by their owner first; nearly all of those would have been the lower band untouched.

One job, followed all the way through.

UK · SDC-2026-0714JOB LOGGED ✓

A Kingston 128GB microSD from a trail camera in a wood, not seen by the camera, a phone or three readers after a winter outside, with two seasons of a landowner's deer survey on it

Nothing on the bench saw it either; the controller had failed and the contacts were corroded besides. The coating was removed, the test pads mapped and cleaned, the raw flash read through a needle adapter and the dump descrambled and rebuilt into a virtual card. The FAT32 volume mounted from the virtual card and the survey's images and clips were copied out in date order.

99% of the files recovered8 days here, and back by post

Illustrative example — replace with a genuine case

What helps, and what harms.

Do this much first

Try one known-good reader on one current machine, without the adapter
Look in Disk Management or Disk Utility for the device
Note what the device it came from says
Send it after that; the first look is free

What sets us back

Trying it in every reader, phone and camera you can find
Initialising a device that shows with no media
Scraping at the contacts
Running the maker's low-level format tool to make it appear

Questions answered before you commit.

Nothing sees the card. Is it dead?

The controller may be. The flash behind it is intact, and the bench reads it directly, through the chips or the test pads. It is monolith work at £299 + VAT, and you are told at the free look whether it is possible before anything is charged.

It shows in Disk Management with no media. What does that mean?

The controller is alive and answered the computer, but cannot find its own table in the flash. It is the same job as a dead controller, done the same way; do not initialise it.

It reads in my camera but not my computer. Is the card failing?

Usually not. The reader, the slot or the file system is the problem. Copy the files from the camera over USB if it allows, or try a current reader. If neither works, send it, and it is the lower band.

What does it cost?

£149 + VAT if a reader still sees the card after the free look; £299 + VAT if none does. Fixed in writing, and on most jobs no data means no bill.

Where this usually leads.

RAW, 0 bytes, or the wrong capacity →microSD →Mac: the disk you inserted was not readable →USB flash drives and pen drives →How a memory card is recovered, from the reader to the monolith →

Nothing gets worse while the card is out of the device.

Looking at it is free. Back comes a list of what opened and what did not, together with a single price to finish, set down in writing while you are still free to say no. Until that list reaches you, leave the card in its bag and format nothing.

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