The platters hold the hard drive's information, and they're incredibly sensitive. Even a tiny speck of dust can render them useless, which is why a hard drive runs enclosed in the first place.
Some hard drives have more than one platters, while other have just one. When a drive has multiple platters, the spacing between them is also very precise, and if they're misaligned at all, the data on a drive can be damaged.
During a mechanical drive’s operation, the hard drive motor spins very fast, creating a very tiny cushion of air, which allows the head to “fly” atop the platter surface. Many drives have multiple heads and multiple platter surfaces. The head travels back and forth across the platter, rapidly locating, reading and storing your data, without actually touching the surface.
A physical jolt or shock may cause the read write head to crash onto the platter media and create a defect or “ding”. An old fashion record player serves as a good analogy. If you bump a turntable while it’s playing the needle will fly across the record surface creating a permanent scratch. The record is ruined, if the scratch is severe the media damage usually presents significant challenge to recover the data.
However not impossible, a great partial recovery can happen. Although the data located in the area where the scratch is may no longer be available, our engineers at Data Analyzers have the capability to restore the rest.