Apple machines · clicking drive · ADR-2025-3453
A Model This Bench Has Opened Before.
It arrived already removed from the iMac, which is the right order in which to do things: a repair centre had pulled the drive and passed it on. The label confirmed the model, a Seagate Barracuda 3TB, ST3000DM001, and the symptoms ran to a single line; the only information provided was that it was making a clicking noise
. All the other information included in the message was about the photographs and how much he wanted to save them. They were the family's pictures and the whole reason for the enquiry, and there were no other copies of them available anywhere. He requested communication via email instead of by phone.
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What failed, and why.
This one does not present anything new and that is why it is helpful. A drive that clicks means that the heads can't locate the references (marks) indicating where they are above the surface of the platters, therefore it attempts to locate them, fails, resets and attempts again. The pattern for this particular Barracuda is familiar to the point of routine: the model has a long, well documented history of failing, and enough have been through here that the donor question is settled prior to receiving the unit. The repair process for this unit is standard procedure. However, the platter underneath is never routine. With each click of the drive, heads that cannot read are sent across the surface that the photos are written upon.
What the bench did with it.
The order of the job →| Equipment used | Its work on this job | The reason for it |
|---|---|---|
| DeepSpar Disk Imager 4 | Imaged with the folder directories of the photo files read first and then the remaining parts of the hard drive | Mapped the heads first, then imaged one face of a platter per pass, with every reset, timeout and the power itself kept under our own control |
| PC-3000 Data Extractor | Each time we would attempt to move past a point where the heads refused to read, we eased off instead of forcing it | Instead of working around the drive's firmware and controller, it works with the two natively |
| R-Studio Technician | Extracted the Mac volume from the image and extracted the photos from it | Constructs an array from the images, and reads nearly every file system |
What the bench did with it.
A known model shortens the guessing
It was not turned on so we could listen for ourselves. We placed it onto a current-limited supply with a meter monitoring the draw, which showed it reaching operating speed and then getting nowhere at all, and the model number did the rest of the investigation work. A donor of the same family and firmware revision was already waiting on the shelf, thus nothing waited on acquiring a replacement.
Matched parts, alignment set
We removed the head stack and placed every slider under the microscope. The heads had failed. The surfaces had not, and presented no scratches along any areas. We installed a donor assembly matched to this model and set its alignment on the bench. When power was applied to the unit it completed the start-up sequence and reported itself correctly.
Photographs first, and the rest afterwards
Because the photographs were the primary purpose for this job, the imaging was ordered around them. The regions holding the photo folders were read at maximum speed first and, after securing these, the remaining portions of the hard drive were imaged. Any area that hesitated was noted and left for shorter passes at the end. The drive remained powered throughout the entire imaging process because a repaired mechanical component provides optimal performance during its initial operation after servicing rather than during subsequent uses.
What went home.
Before reporting any results, each photo was opened and inspected individually, because if an individual photo won’t open, it is not a photo returned, regardless of what the totals say. The photos went home on new media, with the data from the remainder of the hard drive accompanying them. The Barracuda itself remained here. A drive rebuilt using a donor assembly represents a step towards completing a recovery rather than something to retain.
Begin here if yours is doing the same thing.
Other desktop disks on the log.
Yours doing something similar? Power it down first.
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