Disks hold important files and documents: old photos, college papers, financial spreadsheets and other data we don’t want to, or can’t afford to, lose. But when a disk becomes corrupted, all of that suddenly becomes inaccessible.
Errors like this can have a logical or a physical cause, and repeated repair attempts can make things worse. If the files matter, see how hard drive and external drive recovery works, starting with a free diagnosis.
That’s why it’s important to know how to recover a corrupted disk. Don’t assume all is lost: in many cases the device and the files on it can be saved, especially with professional help.
In this article, we take a closer look at what can corrupt a disk and what you can do to avoid losing the data stored on it.
What can cause a corrupted disk?
So what could have corrupted your disk? Although disks are robust devices, certain situations make them vulnerable and can damage their components or the data on them.
These are the main causes of disk corruption:
Operating system bugs
Faults in the Windows operating system can affect your internal or external disk. A bug may open a security hole or corrupt the file system that keeps track of your files. When this happens, the computer often crashes and you can no longer access the stored data.
Dirty power
“Dirty power”, meaning an unstable or poor-quality electrical supply, can make equipment malfunction. Overloaded circuits, undersized wiring, faulty installations and poor grounding are some of the problems that make an electrical system unsafe and can damage the disk. That’s why it’s worth having an electrician check your installation.
Heavy use
Editing photos directly on an external drive or running very demanding games or programs can put a lot of strain on the drive. If it overheats or malfunctions as a result, files, or even the whole drive, can become corrupted.
Hardware failure
Hardware problems can also damage the disk. The device may have a manufacturing defect, or an impact may have damaged its parts. In these cases, it is physical damage that corrupts the disk.
Infections
Virus and malware attacks are among the main causes of disk corruption, since they can damage or encrypt the stored data. That’s why you should keep your antivirus active and up to date and, in the case of external disks, only connect them to computers you trust.
Excessive heat and humidity
Disks are designed to work at high temperatures, but only up to a certain limit (usually around 60 °C). Leaving a computer, laptop or external disk in direct sunlight can make it overheat and, in extreme cases, burn out the disk’s controller board, making the data inaccessible.
Excessive humidity can also affect the internal parts and end up damaging the disk. The casing protects the device, but frequent or prolonged exposure can still cause problems.
Registry cleaners
Registry cleaners are programs that promise to speed up your computer by removing unnecessary entries and files. CCleaner is a well-known example. They usually work well, but there is a risk of deleting important entries from the Windows registry, which can make the system unstable or unable to start.
Bad blocks
Bad blocks are damaged areas of the disk. They can be physical, caused by wear, manufacturing defects or impacts, or logical, caused by interrupted or faulty writes, such as during a power cut.
When a sector fails, the disk replaces it with a spare sector from a reserved area, but the data in the damaged sector may not be readable. The problem is when bad blocks start to multiply: the disk has to keep remapping sectors, slows down and may end up failing altogether. Find out everything about bad blocks on disks here.
Power cuts or surges
Electrical problems caused by sudden power surges or outages can also damage the disk.
Power instability is common during thunderstorms, for example, so it’s best to unplug your equipment when the weather turns. For desktop computers, a UPS helps keep the power supply stable.
Insufficient RAM
When you run a very demanding program or game, the RAM may not be enough to keep the system running smoothly. To avoid crashing, Windows then constantly moves data between RAM and the paging file on the disk, a situation known as “thrashing”.
This puts a heavy workload on the disk and, if it happens too often, adds to its wear, which can contribute to failures.
Age
Disks have a limited lifespan. Depending on the technology, they can last 5 to 10 years, but that can be much shorter if the device isn’t used properly.
So a disk used beyond its useful life can fail and become corrupted, even if you take every care with it.
How to identify a corrupted disk?
A corrupted disk shows some typical symptoms that you’ll notice when you try to use it.
When you try to open a folder or file on the internal or external disk, the computer often shows a message saying the location is unavailable. In some cases, the computer slows down or even freezes while it tries, unsuccessfully, to open the file or folder.
The disk may also start making unusual noises, which point to an internal mechanical problem, such as damaged read/write heads or platters knocked out of alignment after a fall or impact.
These symptoms may mean the disk is failing. If it still works normally, back up your files to the cloud or another drive straight away to avoid bigger losses. If it’s making noises, turn it off and don’t keep trying: every attempt can make the damage worse.
To check whether the disk is corrupted, you can use diagnostic software or the Windows error-checking tool (right-click the drive > Properties > Tools > Check). Only do this after backing up your data, and never on a disk that makes noises or keeps disconnecting.
If you’d rather not do it yourself, or don’t know how, seek professional help to diagnose the device.
Is it possible to recover a corrupted disk?
Yes, in many cases a corrupted disk can be recovered, especially with the help of specialized professionals. Opening the disk at home or running unreliable programs can ruin your chances of recovery.
A corrupted disk doesn’t mean your files are gone for good. Often the data is still there: what’s damaged is the file system that indexes it, or a hardware fault is preventing it from being read.
If the problem is logical and the disk is physically healthy, software can help repair the errors or copy the files. If the problem is mechanical, the disk will need an internal intervention, which must only be carried out with specialized equipment in a cleanroom.
How do I recover a corrupted disk?
Before doing anything else, save what you can. Copy the data you can still access to the cloud or to another device, so you don’t take any more risks.
After that, if the disk shows no signs of physical failure, you can try Windows error checking, which scans the file system for errors and repairs them. Keep in mind that this repair can delete damaged entries, which is why the backup comes first.
If the problems are minor, this may be enough to get the disk and your files back. Often, though, you’ll need to go further.
Another option is data recovery software such as Recuva, EaseUS or Recoverit. These programs scan the disk for files that can still be read and copy them to another drive (never to the disk you’re recovering).
However, they may not work in more serious cases, especially when there’s a hardware fault, and they require some experience to use safely. Any wrong move can make it impossible to recover the disk and the data.
That’s why it’s best to turn to a qualified company to recover your corrupted disk. Specialized professionals, equipment and facilities make the process safer and more effective, especially if the disk needs to be opened to repair mechanical problems, which can only be done in a cleanroom lab.
How do I recover files from a corrupted external or internal disk?
Windows error checking can repair the file system and make your files accessible again, while recovery software reads what is left of the file index and copies the files it finds to another drive.
However, we’d remind you once again that a specialized company offers safer procedures and better chances of getting your data back. If you have important files and documents you can’t afford to lose, choose the safest way to recover a corrupted disk.
That way, you give yourself the best chance of getting your files back.
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How Bot can help you
Bot is a company specializing in data recovery, with more than two decades of experience. We can help you get your files back from a corrupted disk.
Our professionals are trained and experienced in all kinds of data loss cases. We also have the right equipment and a Class 100 (ISO 5) cleanroom, under ISO 14644-1, for working on devices.
With all this infrastructure and experience, we achieve high success rates in recovering data from damaged devices.
Would you like our help? We offer a free diagnosis and free collection (islands not included). Just fill in this form to start recovering your corrupted disk.
