Data Recovery · LanCologne

What does the ‚Read-only‘ error message on a memory card mean in terms of data recovery?

If an SD card displays the message „The media is write-protected“, there are three possible causes: the slide switch on the adapter, a write protection set by software, or – as is often the case – a controller that has permanently switched to read-only mode due to worn-out memory cells.

Free enquiry

Technical background

Flash memory can only withstand a limited number of write cycles. If the controller detects too many defective blocks, it protects the existing data by refusing further write operations. The data is often still readable at this stage – but will not remain reliable for much longer.

What you should – and shouldn’t – do now

  • Check the slide switch and replace the adapter.
  • If it is still read-only: copy all the data straight away; do not format it.
  • Do not use any „remove write protection“ tools that involve low-level formatting.

Here’s how we do it

  • Creation of a complete image, provided the card is legible.
  • Reconstruction of the file system on the image.
  • In the event of reading errors: repeated, careful reading of problematic sections and documentation of unreadable blocks.
  • In the event of read errors, where necessary: read out at controller or chip level, provided this is technically feasible.

Borders

  • Worn-out cells can result in individual damaged files.
  • If the controller fails completely, access is only possible via the chips – though this is not the case for every type of card.

Possible results

Recovered files and a warning that the card should no longer be used.

How we carry out data recovery

Every data storage device is first diagnosed in our own laboratory in Cologne; the diagnosis is free of charge. You will then receive a written quote and can decide whether to accept it. If you decline, you can collect the data storage device from the laboratory by appointment – there are no postage costs involved – or we will post it back to you; in which case postage and packaging costs may apply. Data is recovered from copies, not from the original – using professional data recovery hardware such as the PC-3000. If a drive needs to be opened, this is carried out on a HEPA H14-filtered clean bench. We do not offer a guarantee of success prior to diagnosis, as this is simply not possible in a professional context. Your storage device and your data will remain confidential and will not be passed on to third parties.

1Enquiries and submission by post or in person at the laboratory by prior appointment
2Free diagnosis of the cause of the damage
3Written quotation – we will only proceed once you have approved it; if you decline, you may collect the item from the laboratory or we will return it to you (postage and packaging costs may apply)
4Recovery, data verification and confidential handover

Request a diagnosis   Find out more about the process, costs and confidentiality →

Frequently Asked Questions

Can I simply remove the write protection?+
If it is set by the controller, it is not permanent. It is important to back up the data now.
Can I continue to use the card afterwards?+
No. The write protection is a sign of worn-out flash memory.
Does this also apply to USB-Sticks?+
Yes, USB-Sticks exhibit the same behaviour for the same reason.

Related topics

🔗 Related topics