Mechanical Hard Drive Failure
Clicking, grinding, or a drive that no longer spins up are signs the failure is inside the hardware itself — and, unlike most data loss situations, trying to fix this yourself can destroy data a professional could otherwise have recovered.
What's actually happening
A hard drive is a sealed precision instrument: platters spinning at high speed, with read/write heads floating a few nanometers above the surface, controlled by a small onboard circuit board and firmware. "Mechanical failure" covers a range of physical breakdowns inside that system — a head that has stopped tracking correctly and is scraping or clicking against the platter, a spindle motor that has seized and won't spin the platters at all, a burned-out preamplifier or head assembly, or firmware corruption that stops the drive from initializing even though the mechanics underneath are fine. Each of these looks similar from the outside — the drive isn't detected, makes an unusual noise, or disconnects immediately — but each needs a completely different fix.
How recoverable this really is
The odds are often better than the noise suggests, mainly because the data on the platters is usually still physically intact — the failure is almost always in the mechanism trying to read it, not in the magnetic data itself. But that same fact is exactly why amateur intervention is so risky: platters need a controlled, particle-free environment to open safely, and swapping parts between drives — a popular DIY suggestion for a "clicking" drive — only works in a narrow set of cases, and can permanently misalign the heads or scratch the platter surface without the right equipment and a matching hardware revision.
The general approach
Professional recovery separates diagnosis from data extraction. The drive is examined, often through its diagnostic port, to identify the specific failure without powering through it repeatedly — every additional spin-up of a struggling drive risks further, sometimes total, damage to the platter surface. Depending on what's found, recovery might involve firmware-level repair, replacing a physically compatible head assembly in a cleanroom, or specialized hardware that reads the platters directly. The goal throughout is to get one clean, complete image of the drive as early as possible — after that, all further recovery work happens on the image, never on the original failing drive again.
Don't repeatedly power the drive on "to see if it still works," don't freeze it, and don't open the case outside a real cleanroom. These are long-standing pieces of internet folklore that occasionally worked decades ago on very different hardware — on modern high-density drives, they routinely turn a recoverable failure into a permanent one. Power the drive off, and stop there.
Practical, step-by-step guides for specific recovery software will be added here as separate linked articles.
This page describes the general situation, not a guaranteed fix for your specific case. If you'd rather have someone experienced take a look before you try anything, see what a hands-on evaluation looks like.