Your laptop is a little slower than it used to be. Files take a moment longer to open. The spinning beach ball — or Windows’ hour glass — shows up more than it should. You’ve been meaning to look into it, but it hasn’t stopped you working yet. A failing drive rarely announces itself with a bang. It does it quietly, over weeks, until one morning it doesn’t announce itself at all.
Storage drive failure is one of the most common causes of data loss we encounter — and one of the most preventable. The warning signs are almost always there before the drive gives out completely. The problem is that most people either don’t recognise them, or mistake them for a software issue and do nothing. This article covers the warnings, what they mean, how to check your drive’s health right now, and what your options are depending on how far things have progressed.
HDD vs SSD: Two Very Different Ways to Fail
Before getting into the warning signs, it helps to understand that hard drives (HDDs) and solid-state drives (SSDs) fail in completely different ways — and give very different amounts of warning when they do. Knowing which type of drive you have shapes how urgently you should act on any symptom you spot.
HDD — mechanical, gradual, audible
Traditional hard drives contain spinning magnetic platters and a moving read/write head. They are mechanical devices with physical wear. They typically give more warning before failure — through sounds, slowdowns, and errors that accumulate over time. When they fail, data is often still recoverable, though that window can close quickly.
SSD — silent, fast, and sometimes sudden
Solid-state drives have no moving parts. They’re faster and more resilient to physical shock than HDDs. But their failure mode can be more abrupt: a completely healthy-looking SSD can stop working with very little warning, particularly when it fails due to firmware corruption or controller failure rather than gradual cell wear. “My SSD was fine yesterday” is something we hear regularly.
Most laptops bought in the last five years contain an SSD. Most laptops from 2015 or earlier — and many budget machines up to around 2018 — contain an HDD, or a hybrid. If you’re not sure which you have, check your system information: on a Mac, go to Apple menu → About This Mac → Storage; on Windows, open Device Manager or search for “Disk Management.”
Warning Signs: Hard Drive (HDD)
Sounds — the most unambiguous warning
A healthy hard drive is nearly silent, with perhaps a faint hum during heavy read or write operations. Any sound that wasn’t there before is a warning sign. The most serious is clicking — a regular, repetitive click or series of clicks coming from inside the machine. This is caused by the read/write head repeatedly failing to locate data on the platter and resetting. In the repair industry it’s known as the “click of death,” and it is not recoverable without specialist data recovery equipment. If your laptop is clicking, stop using it immediately.
Grinding or scraping sounds indicate physical contact between the read/write head and the platter surface — potentially catastrophic damage happening in real time. Again: stop, back up if you still can, and do not continue normal use.
Whirring, spinning up and down repeatedly, or any change in the normal sound character of the drive are all worth paying attention to.
Performance degradation
A hard drive that is developing bad sectors — areas of the magnetic surface that can no longer hold data reliably — will slow down noticeably. The drive repeatedly retries reading from the failing area before either successfully recovering the data or giving up. This shows up as unexplained pauses when opening files, an application that seems to freeze briefly then resume, or a file that takes far longer to open than it should.
A machine that used to boot in 30 seconds and now takes two minutes — with no new software installed — is showing a classic sign of HDD degradation.
File and system errors
- Files that can no longer be opened, or that open with corrupted contents
- Folders that appear empty when they shouldn’t be
- Applications that crash on launch when they previously worked
- Unexpected error messages when copying or moving files
- The operating system asking to run a disk check on startup (Windows) or flagging filesystem errors (Mac)
- Kernel panics on Mac, or Blue Screen of Death on Windows, with disk-related error codes
Warning Signs: Solid-State Drive (SSD)
SSD warning signs are subtler and easier to miss, partly because there are no sounds to alert you and partly because some SSDs provide limited diagnostic information before they fail.
Sudden and severe slowdowns
An SSD that was fast and is now inexplicably slow — particularly for read operations — may be experiencing cell degradation or a controller problem. If your laptop feels as slow as it did when it had a hard drive, and it definitely has an SSD, this is worth investigating. On Macs, this can sometimes be confused with a macOS issue, but if a clean reboot and software elimination don’t help, run a SMART check (covered below).
The drive disappearing
If your internal drive intermittently fails to appear in Finder, Windows Explorer, or Disk Utility, the SSD’s controller is struggling to maintain a stable connection. This may happen once and not repeat — which makes it easy to dismiss. Don’t dismiss it. Back up immediately and treat it as an early failure warning.
Files corrupting or write failures
An SSD nearing the end of its write cycle life will often transition to a read-only state as a protection mechanism — preventing further writes to avoid making data unrecoverable. If you start seeing errors when saving or copying files to your internal drive, or if the drive reports itself as write-protected when it shouldn’t be, this is a significant warning.
Age and total bytes written
SSDs have a finite write endurance measured in TBW (terabytes written). Consumer SSDs are typically rated for between 150 and 600 TBW depending on capacity and grade. A drive that has approached or exceeded its rated TBW is statistically more likely to fail. This figure is readable from SMART data — which we’ll cover next.
The perception that SSDs are more reliable than HDDs is broadly true for physical shock resistance and general longevity — but it has created a dangerous assumption that they don’t fail. They do, and when they fail due to controller issues or firmware corruption (rather than cell wear), it can happen with very little advance notice. An SSD that’s working perfectly today can be completely unresponsive tomorrow. The only protection against this is the same as for HDDs: current, regular backups.
How to Check Your Drive’s Health Right Now
Both Mac and Windows include free built-in tools to check your drive’s health. Running a check takes under two minutes and gives you objective data rather than guesswork.
On a Mac
Open Disk Utility (Applications → Utilities → Disk Utility). Select your internal drive from the left panel. In the top bar, click First Aid and run it. Separately, look for the SMART status reported in the drive information panel — it will say either “Verified” (healthy) or “Failing.” A “Failing” status is an unambiguous signal to back up immediately and replace the drive.
For more detailed SMART data — individual attribute values rather than just a pass/fail result — free third-party utilities like DriveDx or SMART Utility provide a much fuller picture, including total bytes written, reallocated sector count, and power-on hours. These are worth installing on any machine more than three years old.
On Windows
CrystalDiskInfo is the standard free tool and shows full SMART data for all connected drives. A drive in good health shows all attributes in blue. Yellow indicates a caution state — the attribute has degraded but hasn’t reached the failure threshold. Red indicates a critical warning. Download it directly from the developer’s official site.
Windows also has a built-in drive health check through the Device Manager and Windows Security → Device performance & health, though these give less detail than CrystalDiskInfo.
- Reallocated sectors count (ID 05): The drive has found areas of the surface it can no longer trust and has moved data away from them. A non-zero and growing value means the drive is actively compensating for damage. Act promptly.
- Uncorrectable sector count (ID C6): Areas the drive attempted to read and couldn’t recover at all. Any non-zero value here is serious.
- Pending sector count (ID C5): Sectors flagged as suspect, waiting to be tested and potentially reallocated. Growing numbers indicate active degradation.
- Total bytes written / percentage used (SSD): How far through the drive’s rated write endurance you are. Most consumer SSDs report this; a value approaching 100% deserves attention.
- Power-on hours: Total running time. Context for interpreting other values — high hours on a drive with a few reallocated sectors is less alarming than the same count on a drive with low hours.
What to Do, Depending on Where You Are
Drive is showing early warnings but still working
- Back up everything immediately. Do not put this off until tomorrow. If you don’t have an external drive, buy one today or use cloud backup — iCloud, Google Drive, or OneDrive set to sync your most important folders. If you’re on a Mac, enabling Time Machine to an external drive takes five minutes.
- Stop using the machine for anything you can’t afford to lose until the drive is replaced. The clock is running — you don’t know if you have days, weeks, or hours left.
- Arrange a drive replacement proactively. Replacing a drive that’s still functioning is clean, fast, and straightforward. The data migrates safely to the new drive. Replacing a drive that has already died is a completely different — and potentially much more expensive — problem.
Drive is making sounds (HDD)
If your HDD is clicking or grinding, every additional read operation risks the head making contact with the platter surface and destroying data that might otherwise be recoverable. If you hear these sounds:
- Stop what you’re doing and leave the machine powered on (don’t shut down — the startup sequence is a significant load)
- If you have an active backup, you may be in better shape than you think — assess that first
- If you don’t have a backup, contact a professional data recovery service before attempting anything. Do not try to copy files yourself; do not run First Aid or chkdsk; do not reboot.
Drive has already failed — machine won’t boot
If the machine starts but cannot find the operating system, or starts showing a folder with a question mark (Mac) or “no bootable device” (Windows), the drive has either failed completely or developed a fault severe enough to make the system partition unreadable. Data may still be on the drive — it’s the structure that the OS uses to find files that has failed, not necessarily the underlying data itself.
At this point, professional data recovery is the route to take. The approach depends entirely on the type of drive and the nature of the failure.
Data Recovery: What’s Actually Possible
Professional data recovery is not the same as taking the drive to a repair shop and asking them to copy the files off. It’s a specialised process that varies significantly depending on the failure type, the drive technology, and how much the drive has been used since the failure occurred.
Logical failure — the most recoverable
If the drive is physically intact but the filesystem has been corrupted — the map that tells the operating system where files are stored — specialist software can often reconstruct the directory structure and recover most or all of the files. This is the most common type of failure on SSDs that were working normally until they suddenly stopped mounting, and on HDDs that developed filesystem errors without physical damage. Success rates are high when the drive is physically sound and hasn’t been overwritten after the failure.
Physical failure — requires specialist equipment
For HDDs with physical damage — clicking heads, seized motors, damaged platters — recovery requires a cleanroom environment. Even a single dust particle landing on an exposed platter during an amateur recovery attempt can permanently destroy data. This work is done by specialist recovery firms, not general repair shops, and the cost reflects the equipment and expertise involved. If your data is irreplaceable, this cost is usually worth it. If the data is replaceable or already backed up elsewhere, it probably isn’t.
Encrypted drives
Modern Macs with Apple Silicon encrypt the internal drive by default using hardware-bound keys. If the logic board fails along with the drive — or if the drive fails in a way that prevents the T2/M-series chip from communicating with it — this encryption can make recovery significantly more complex or, in some cases, impossible. This is an important reason to maintain external backups: iCloud or Time Machine to an external drive creates an unencrypted copy that isn’t dependent on the machine’s hardware being functional.
- Don’t run Disk Utility First Aid or chkdsk on a physically damaged drive. These tools perform write operations to repair filesystem structures. On a failing drive, writes can overwrite recoverable data with garbage.
- Don’t install a new OS on the same drive hoping to “fix” it. The installation process will overwrite large portions of the drive.
- Don’t freeze the drive. The “freezer trick” is a decades-old workaround for a specific HDD failure type that briefly contracts metal components. It doesn’t work reliably, risks condensation damage, and is at best a last resort — not a first step.
- Don’t open the drive yourself. Hard drives are assembled in cleanroom conditions. Opening one on a kitchen table exposes the platters to dust particles that will cause permanent damage on first spin.
Replacing a Failing Drive — and Getting More Than You Had
Drive replacement doesn’t just restore your machine to where it was — depending on what you’re replacing, it can make the machine feel noticeably better than it ever did.
Replacing an HDD with an SSD
If your machine currently has a mechanical hard drive and you’re facing replacement, upgrading to an SSD is one of the most transformative improvements you can make to an older laptop. Boot time drops from minutes to seconds. Applications open instantly. The machine stops making noise. Battery life typically improves. An older laptop that felt sluggish and was being considered for retirement can feel genuinely quick again after an SSD swap — and the difference is more dramatic than almost any other hardware upgrade.
Most laptops from 2012 to 2018 that shipped with HDDs can accept a SATA SSD replacement. A technician can confirm compatibility for your specific model before any work begins.
Replacing an SSD with a larger or faster SSD
If your existing SSD was small — 128GB or 256GB was common on budget machines — replacement is also an opportunity to upgrade to a larger capacity. Running a near-full drive is itself a contributing factor to SSD degradation, so moving to a more spaciously-sized replacement makes practical sense beyond just the repair itself.
Practical Recommendations
- Run a SMART check today if your machine is more than three years old.Takes two minutes and costs nothing. Disk Utility on Mac shows a basic pass/fail. CrystalDiskInfo on Windows gives the full picture. DriveDx on Mac gives detailed attribute data. If anything shows yellow or red, treat it as urgent.
- Set up automatic backup before you need it.Time Machine on Mac with an external drive runs automatically in the background and requires no ongoing attention once set up. On Windows, File History or a scheduled backup to an external drive achieves the same. Cloud backup adds a second layer. You want at least one local backup and one offsite — so that a single event (theft, flood, fire) can’t destroy both the machine and the backup simultaneously.
- If you hear clicks or grinding from your laptop, stop using it.This is not a “keep working and see if it gets worse” situation. These sounds indicate imminent mechanical failure. If you have no backup, prioritise data recovery above all else before attempting any repair.
- Don’t wait for complete failure to replace a degrading drive.A drive replaced while still functional is a clean data migration job. A drive replaced after it’s failed is a data recovery job — more time, more cost, less certainty. The right time to replace a drive showing SMART warnings is now, not after the next crash.
- Treat a “no bootable device” error as a data recovery situation first, drive replacement second.If the machine can’t boot, your instinct might be to reinstall the OS to get back to work. Resist this. Reinstalling will overwrite data that may still be recoverable. Get the data first.
- For Apple Silicon MacBook owners specifically: back up externally, not just to iCloud.The soldered SSD in M-series MacBooks means that if the storage fails or the board is damaged, the data on it is effectively inaccessible. iCloud is useful but is not a full system backup. Time Machine to an external drive remains the most complete and reliable safety net.
Worried About Your Drive — or Already Lost Data?
If your machine is showing any of the warning signs covered above, the most useful thing you can do is bring it in for a proper assessment. We’ll check the drive’s health, tell you what we’re seeing, and give you an honest picture of your options before any work begins.
If data recovery is needed, we offer professional recovery services for both HDDs and SSDs — logical failures, physical failures, and everything in between. If you’re not sure whether recovery is possible, bring it in and we’ll find out.
