Resources · Recovery Guides

Data recovery guides.

The practical, device-by-device guide to what to do (and what not to do) as soon as your storage begins to fail. Based upon over two decades of experience in-house, recovering failed devices, since the correct initial steps are usually critical to whether your data will ever come back.

Written by our engineers
Over two decades in Bristol
HDD, SSD, RAID & more
// the golden rule

If in doubt, switch it off.

Most data loss occurs after the failure, by proceeding regardless of the failure. All five steps below apply to every device listed below.

Power off
at the first odd noise
Don't
run software on a dying drive
Never
open the drive yourself
Label
RAID / NAS disks in order
// first five minutes

Your drive just failed. Do this first.

There are five steps that protect both your data and your chances of full recovery from any failed storage device. Go through these steps before doing anything else.

01

Stop using it

Every photo taken, file saved or program opened can overwrite data still recoverable. Set the device down immediately!

02

Power it down

If it is clicking, beeping or will not spin, switch the device off immediately. Each time a physically failing drive powers up risks damaging the drive beyond recovery.

03

Don't run software

For a physical failure of a drive, the recovery and “repair” tools keep power flowing to the drive and continue hammering weak points in the drive until typically, but not always, it becomes lost permanently.

04

Don't open it or DIY

No freezer tricks, don’t open the case, no swapping circuit boards. These myths have caused real damage to many devices, often irreversible.

05

Get a free diagnostic

Leave it here or send it to us fully insured. We will let you know just what you can recover and at what cost prior to starting any chargeable work.

// jump to a guide

Guides by device.

Select the type of media you are having trouble with for the warning signs, do’s & don’ts and process of recovery for that media.

// hard-drive recovery

Hard drive recovery guide.

Hard drives fail in two completely different ways. Data loss due to logical failure (deleted, formatted or corrupted) means the drive still functions and is often the least damaging way to attempt to recover from. However, physical failure (failed head, motor seizure or dead electronics) requires bench time and the wrong first step could destroy your chances of recovery. Identifying which category your hard drive falls into is the key to success.

!Warning signs
  • A clicking, beeping or grinding noise on power-up
  • The drive doesn't spin up, or spins then stops
  • It disappears from the BIOS, or vanishes mid-use
  • Very slow, with long freezes opening files
  • A SMART warning at boot
✓Do this
  • If it still reads, back up your most important files first
  • Stop using it the moment you hear an unusual noise
  • Note exactly what happened — dropped, power cut, or just died
  • Keep it cool, still and disconnected until it's looked at
✕Avoid this
  • Power-cycling a clicking or non-spinning drive over and over
  • Running repair or recovery software on a failing disk
  • Opening the casing or swapping the circuit board yourself
  • The "freezer trick", or giving it a knock

Recovery of hard drives takes place internally at our facility. This involves replacing damaged components (heads and other parts), imaging weak drives sector-by-sector and repairing damaged file system structures.

More on hard drive recovery →
// ssd & nvme recovery

SSD & NVMe recovery guide.

Solid state drives do not contain any moving parts therefore do not click or grind; instead, they normally fail without warning and quietly. Normally, controller lock-up, firmware faults and “sudden death” account for these types of failures. In addition to their lack of mechanical movement, solid state drives differ from hard disk drives in two major areas: TRIM (the automatic deletion of files within minutes after deleting them) and the gradual decline in power retention by flash memory over an extended period of time while idle.

!Warning signs
  • The drive vanishes from the BIOS, often overnight
  • It reports the wrong capacity, or 0 bytes
  • It turns read-only, or slows to a crawl then disappears
  • It died during or just after a firmware update
✓Do this
  • Stop writing to the drive straight away
  • After an accidental deletion, power down fast — TRIM works in minutes
  • If you store an SSD long-term, power it up occasionally
✕Avoid this
  • Carrying on using the PC after deleting something (TRIM)
  • Running "secure erase", repair or optimisation tools
  • Assuming deleted always means recoverable on an SSD
The TRIM catch: most SSDs start deleting the flash cell(s) associated with a deleted file within minutes regardless if you restart or continue writing to the drive. Therefore, if you delete something you want recovered, shut down immediately and do not write anything else to the drive until recovery has occurred.

Our engineers access the NAND in technical mode directly and restore the translation table of the drive along with accessing the controller to retrieve data from dead SSDs.

More on SSD & NVMe recovery →
// external drive recovery

External hard drive recovery guide.

External drives are essentially normal hard disks or solid state disks (SSDs) with a casing surrounding the disk; therefore an external drive will also fail like a normal disk plus two additional types of failure: the USB-to-SATA bridging board and encryption applied to many enclosure devices. This is why many people get no usable information when removing an encrypted disk from an enclosure and attempting to access it.

!Warning signs
  • It doesn't appear on any computer, cable or port
  • Windows or macOS prompts you to format it
  • It clicks or stops mounting after being knocked or dropped
  • The light comes on but nothing mounts
✓Do this
  • Try a different cable and port first — it rules out the simplest cause
  • If it was dropped or is clicking, stop and send it in
  • Remember many externals are encrypted at the bridge
✕Avoid this
  • Replugging a clicking or dropped drive again and again
  • "Shucking" an encrypted drive to read it raw — you'll get ciphertext
  • Formatting it when prompted

We bypass bridge board failures, remove and decode the bridge encryption, perform motor and head repair on dropped units, all done within our facility.

More on external drive recovery →
// usb stick recovery

USB flash drive recovery guide.

USB sticks consist of a small flash memory on a tiny controller. The good news: if a USB stick fails, it is generally either the controller or the connection between the stick has been snapped off, however the data contained within the memory of the flash remains intact. The bad news: since the flash was accessed using the controller, the data stored in the memory is scrambled by the controller, which makes extracting this data difficult, certainly outside of the realm of standard “repair” tools.

!Warning signs
  • It isn't recognised, or shows no light at all
  • It prompts you to format before it'll open
  • The connector is bent, wobbly or snapped off
  • It connects and drops out at random
✓Do this
  • Stop using it as soon as there's a problem
  • If the connector has snapped, keep both pieces
  • Note what was stored on it
✕Avoid this
  • Wiggling or forcing a loose connector — it cracks the board
  • Reformatting it
  • Trusting a "USB repair" tool that writes to the drive

We extract and read the memory chip itself directly (via chip-off method or through the internal test pads on monolithic stick designs) and build your original files from the extracted raw flash.

More on USB stick recovery →
// memory card recovery

SD & memory card recovery guide.

Memory cards typically corrupt due to two primary factors: a photo/video write process interrupted by removing the card (camera shutting down), or formatting the card by mistake from within the camera. Both of these scenarios cause corruption of the file index; however, in both instances the actual photos and/or videos remain uncorrupted and may be recoverable. The critical element is to ensure you do not overwrite the corrupted file(s) prior to recovering them.

!Warning signs
  • The camera shows 'card error' or asks you to format the card
  • Files appear as 0 bytes, or the card looks empty
  • It won't mount on a computer
  • It's stuck read-only or write-protected
✓Do this
  • Stop shooting immediately — each new photo can overwrite a lost one
  • If it was formatted by mistake, don't reuse the card at all
  • Flip the lock switch to read-only to keep it safe
✕Avoid this
  • Carrying on using the card
  • Formatting it when prompted to
  • Letting the camera "repair" or rebuild it

We create a bit-for-bit copy of the memory card and we use specific algorithms based upon the file signature characteristics associated with each type of media (photos and video) to isolate them from other unusable data. Once isolated we recreate a hierarchical file structure similar to how an operating system would display it: SD, microSD, CompactFlash, XQD, etc.

More on memory card recovery →
// mac & macbook recovery

Mac & MacBook recovery guide.

Modern Macs are complicated for the recovery process by two things. First, with the switch to APFS (Apple’s file system), there is potential for an error during an update to leave the file system damaged. Second, the T2 or Apple Silicon security chip will “lock” your storage media using encryption; this media is typically attached directly to the logic board via soldering. So now your data exists only as readable files on that board so long as it remains working and you have the decryption key.

!Warning signs
  • A flashing question-mark folder at boot
  • It won't start after a macOS update
  • Liquid was spilled on it
  • It's stuck asking for your FileVault password or key
✓Do this
  • Keep your FileVault recovery key safe — without it, encrypted data can't be unlocked by anyone
  • Stop using a liquid-damaged Mac straight away
  • Note your macOS version and what happened
✕Avoid this
  • Keeping a liquid-damaged board powered — corrosion spreads
  • Reinstalling macOS over your data
  • Assuming the soldered SSD is fine just because the rest of the Mac isn't

When performing chip level repairs on Macs, we will create images of encrypted Mac storage, reconstruct broken APFS container data, and access FileVault (encrypted) partitions using your encryption key.

More on Mac & MacBook recovery →
// laptop & pc recovery

Laptop & PC recovery guide.

For a Windows laptop or desktop computer, a non-booting condition typically does NOT indicate that your data is at risk. In many cases, the issue is simply a bad operating system installation rather than physical failure of the drive(s). Therefore, the first step for recovering data from a Windows machine is to determine whether the problem lies with the operating system or if there is also a physical failure in one or more of the drives. If the physical issues exist, then proper steps must be taken immediately to prevent loss of recoverable data due to further failure of a drive.

!Warning signs
  • It won't boot, or blue-screens before Windows loads
  • It freezes constantly, then stops booting altogether
  • A SMART warning appears at startup
  • A hard drive clicks, or an SSD has simply vanished
✓Do this
  • If it's an OS problem, your files are recoverable — get the drive imaged
  • If you see a SMART warning, back up now and replace the drive
  • Check whether it's a hard drive or an SSD — it changes everything
✕Avoid this
  • Running chkdsk or repair tools on a physically failing drive
  • Reinstalling Windows before recovering your data
  • Rebooting a drive that's clicking

We perform drive imaging to allow successful recovery from dead, dying, or failing mechanical hard disk drives (HDD), solid state disks (SSD), Dell, HP, Lenovo and other computers.

More on laptop & PC recovery →
// raid & nas recovery

RAID & NAS recovery guide.

RAID arrays and NAS devices provide redundancy for the event of a disk failing. However, they are not backups. The problems begin when a second disk fails, or during an attempted rebuild into a bad disk. In fact, the worst thing you can do to your data is to rebuild onto a disk that is already going bad or to let it reinitialise into the same disk. Once this occurs, you may lose forever the very data that you were attempting to preserve.

!Warning signs
  • The array shows as degraded, or has dropped offline
  • A Synology or QNAP reports 'volume crashed'
  • A rebuild failed, or the controller has died
  • Two or more disks have failed
✓Do this
  • Stop — don't let it rebuild or re-initialise
  • Take the disks out and label each with its bay order (1, 2, 3...)
  • Send us every disk, including any that have already failed
✕Avoid this
  • Rebuilding onto a suspect or failing disk
  • Resetting or re-initialising the NAS
  • Changing the order of the disks, or forcing the array back online
What to send: just the disks; don’t include the case or controllers. Remove the disks yourself and label each one so that we know their respective positions in the array. This information allows us to properly rebuild your array once recovered. For additional details regarding our NAS recovery capabilities including Synology and QNAP devices see our NAS recovery page.

We make an image of every disk using read-only access. Then we rebuild the virtual representation of the stripe, parity and disk order of the array and then run file system repairs on top, vendor neutral.

More on RAID recovery →
// before it happens

Protect your data: best practice.

The least expensive recovery will be the one you do not have to use. To protect your data before something goes wrong simply follow a few habits:

01

Follow the 3-2-1 rule

Make at least 3 copies of everything that could be lost (on at least 2 different forms of media) & keep one off site (or in the cloud). Don’t think one drive = backup.

02

Test your backups

If you have never recovered a backup file, it’s hope, not a backup. Open files from backups every now & again to ensure they still work.

03

Act on early warnings

As soon as possible after experiencing unusual noises, repetitive freezing, files that won’t open, or SMART warnings on a hard drive back up and replace the drive. These signals are coming from a failing disk asking for help.

04

Mind your SSDs

If you delete a file, you should act immediately because solid-state disks (SSDs) can erase deleted data within minutes by means of TRIM technology. Never let an SSD that is your only copy sit idle and unpowered for months, as over time flash memory slowly drains away its charge.

05

Handle drives gently

Drops, heat, water and static electricity damage hard drives. Protect your drives by keeping them padded/protected, cool, dry; power-down before physically handling; and always discharge static electricity by grounding yourself when reaching into your computer.

06

Protect against power

A surge protector (preferably a UPS unit for desktop computers and NAS units) protects your devices from surges and/or sudden loss of power which can destroy file systems or burn out circuit board components.

// don't believe it

Recovery myths, busted.

There are many “fix-it-fast” solutions online to help you fix your hard drive, but many of them can cause more damage to your hard drive than they could possibly repair. Here are the ones we see ruin the most drives.

✕“Sticking your failed hard drive in the freezer.”
✓An old solution that has caused much more damage than good by creating condensation, causing physical stress (thermal shock) to the electronic parts and the surface of the disk platter. Simply keep the drive at room temperature and ship it out.
✕“The recovery software will get all your data back.”
✓Recovery software only helps with recovering your lost files from a damaged file system where the drive is still intact. However, if there is a hardware failure on your drive, running this type of software simply continues to power the failing drive and accelerates the failure process. If the drive makes noises or acts strangely, STOP using it NOW.
✕“Your drive clicks when you access it, you just need to give it a few taps on the side to make it run right again.”
✓Clicking usually means that the head(s) are either worn down to the point that they are having trouble reading the tracks, or even worse, have crashed into the platter. Every time you click the heads against the platter, you scrape away a little bit more material until the heads finally crash completely and render your entire drive useless. Tapping or shaking it only speeds up the damage. Give your drive a rest and turn it OFF!
✕“You deleted some of your important files so they are gone forever.”
✓Hard drive deleted data usually remains until overwritten; do not continue to use that storage device. For an SSD, once TRIM is activated, the file can be deleted in mere minutes, thus take action as quickly as possible.
✕“I’ve got RAID, I’m backed up.”
✓RAID may protect against the loss of one hard disk but does not provide protection for accidental erasure of files, corruption, ransomware or if a RAID array fails during the rebuild process. RAID provides redundancy and is NOT a backup; you should always have a second location for all data.
✕“Windows re-installation / macOS re-install is safe.”
✓All Windows re-installs & macOS re-installs overwrite those exact locations where your missing files are stored. Before proceeding with a re-installation of either operating system, first attempt to recover your missing files and then proceed with your re-installation.
// when you're ready

Not sure what you're dealing with? Let us look.

Every recovery begins with a complimentary written diagnostic report. This report will advise you which items are recoverable and the costs associated with recovering them prior to us performing any billable services; in most cases you only pay if we recover your data.

Drop off at Castlemead, Bristol BS1 3AG · or post insured · Mon–Fri 9am–5:30pm
Call us — 0117 332 1137
Mon–Fri · 9am–5:30pm · No fix, no fee
Start a free diagnostic →