FAQ

Symptoms

A defective hard drive PCB (Printed Circuit Board) is a damaged component that prevents the hard drive from being recognized by the system, usually caused by a power surge, a faulty power supply, or a sudden electronic failure. When the PCB fails, the hard drive becomes inaccessible, even if the magnetic platters containing your data remain physically intact.

Characteristic Signs

• Burning smell: sign of a burnt electronic component on the PCB
• Hard drive not recognized: the BIOS or OS no longer detects the drive
• No spin: the drive does not start or stops immediately
• Visible burn marks: black marks or melted components on the board

A hard drive not being recognized by the BIOS is a hardware or software failure that prevents the boot system from detecting the storage device, making data access impossible without technical intervention.

To access the BIOS, press F2, F9, F12 or Delete depending on your motherboard manufacturer, immediately after powering on. The BIOS will display the list of detected devices, allowing you to confirm whether the drive is recognized or not.

Formatting a hard drive is an operation that erases the logical structure of a storage medium, making the data inaccessible without physically deleting it immediately. Whether due to inadvertence or a system prompt, a formatted hard drive represents a software-type problem: your data is no longer visible, but it can still be recovered if you act quickly and correctly.

According to data recovery experts, more than 90% of data lost after accidental formatting is recoverable, provided that no new writing has occurred on the disk since the incident.

After reinstalling your operating system (OS), you find that you no longer have access to your data stored on your hard drive. This problem frequently occurs during an OS reinstallation and is in most cases related to a modification of the hard drive's partition table — a software cause, not a hardware one.

A failing hard drive is a mechanical storage device whose internal components, platters, read/write heads, and motor, are compromised to the point of no longer guaranteeing reliable access to data. As a general rule, each additional rotation of a damaged drive irreversibly worsens the damage (domino effect). The read/write heads fly over the platters at a height of 5 to 10 nanometers, which is about 1,000 times less than the thickness of a human hair, meaning that the slightest shock or particle of dust can permanently scratch the magnetic surface and make data recovery impossible.

A hard drive damaged by fire or flood presents a serious physical failure requiring specialized intervention. Disasters of this type cause several types of cumulative damage:

• Thermal damage (fire): melting of electronic components, deformation of magnetic platters, carbonization of read heads
• Water damage (flood): moisture infiltration into the housing, oxidation of circuits, deposits of limescale or mud on the platters
• Combined damage: electronic short circuit, corruption of magnetic sectors, firmware failure

A hard drive that has been dropped is a storage device that has been physically damaged due to a mechanical impact, most often affecting the read/write heads or the surface of the magnetic platters. According to DriveSavers Data Recovery data, more than 40% of physical hard drive failures result from a shock or fall. If your hard drive no longer starts after a fall, do not attempt to restart it: each additional attempt risks aggravating the damage and reducing the chances of data recovery by up to 60% (source: Ontrack, 2023).

An unusual noise from a hard drive — repetitive clicking (« click-click-click »), screeching, or dull thumping — indicates an internal physical failure, most often involving the read/write heads.

Two main causes are identified:

• Defective read/write heads: they can no longer read the magnetic platters, producing a characteristic clicking sound and preventing the drive from initializing.
• Damaged platter surface: scratches or defective areas generate a screeching noise and make data reading impossible.

Key point: Any abnormal mechanical noise from a hard drive indicates a hardware emergency. Each additional startup cycle worsens the damage and reduces the chances of data recovery.

A hard drive not recognized by Windows or Mac OS is a problem that can stem from two distinct origins: a physical failure of the drive itself (damaged sectors, mechanical failure) or a software malfunction related to the operating system or file system. Identifying the exact cause is essential before any data recovery attempt.

An operating system (Windows or Mac OS) that stops during startup is generally a sign of operating system corruption or a physical hard drive failure, particularly damaged disk surface or faulty read/write heads.

Two main causes explain this symptom:

1. Software corruption — Critical system files are damaged due to a failed update, power outage, or malware infection.
2. Physical hard drive failure — The magnetic surface of the disk (bad sectors) or the read/write heads are degraded, preventing the system from loading completely.