Plug-in externals · lab record · ADR-2025-3670
The Light Was On. The Disk Was Never the Problem.
He said the drive was no longer being recognised by my mac
, but everything looked fine: it just sat there, connected and the blue light is on
. He had also performed what is normally the test that settles the most, borrowing a second machine: his Mac and his partners laptop fail to see the hard drive
, both at the exact same time. What he wanted was access again to his music software, and he had already purchased an SSD to move it to. At this point, he asked us one thing first, the question anybody asks: is the problem with the actual disk itself, or is it simply the box around it?
Same story on yours? Tell us what it does — the look is free.
0203 0868633
What failed, and why.
External drives are essentially two separate products in the same package, with vastly different lifespans. The disks themselves are simply standard SATA mechanisms found in virtually every internal desktop computer. There is a much smaller board in front of each disk that converts SATA to USB and is built to a price, with little to no cooling provided. This is typically the board that will go bad first, and when it does, you’ll get the exact symptoms described above: the power comes through to the board, the light turns on, but none of your computers can see the storage. And therefore, the order of suspected failure begins with the bridge, then moves to firmware, and lastly to the disk mechanism itself, which is why a broken platter, the explanation people reach for on their own, belongs at the end of the list of suspected failures instead of near the beginning.
What the bench did with it.
The order of the job →| Equipment used | Its work on this job | The reason for it |
|---|---|---|
| ACE Lab PC-3000 Express | Below ATA level, interrogation revealed that the bare disk responded properly to everything it was asked. | This allows access to the manufacturer's service area (where normal ATA commands cannot go) |
| RapidSpar | A simple full copy: a disk responding this clearly needs nothing more aggressive. | This is the less aggressive of the two imagers we have available, for use where a disk remains healthy. |
| R-Studio Technician | Opened volume on the copy image, and sampled content from each area. | Constructs an array from the images, and reads nearly every file system |
What the bench did with it.
The disk out, and onto a bench port
The disk was removed from the enclosure, plugged straight into a bench SATA connection and isolated completely from the bridge board. It started spinning, displayed its correct model number string, reported correct capacity and accepted vendor command strings without hesitation. By every measurable criterion it was a functioning disk, and in under a minute the major question was answered.
Read the logs before ringing him
Although a disk may appear to be operating properly, it may be headed towards failing, so no call was made to him until we had read two important values: the reallocated sector count, and the total number of entries in the grown defect list. Both of those values were normal for a disk of that age. Samples collected from every section of the disk completed successfully at the first attempt, with no retries recorded, which distinguishes a functional disk from one that is simply trying to function.
A full-speed copy, and a verdict
The copy was performed at the drive's rated speed, beginning to end, with nothing forced out of it, no retries, and no new defects logged. At that point, only one remaining piece could be responsible for this failure. The bridge board had failed, leaving the disk inside perfectly operational.
What went home.
His music software was moved onto the SSD he had recently acquired, and opened and tested here before it was sent anywhere. He received the original Samsung disk back as well. Nothing was wrong with it in the first place, and nothing about the recovery has changed that, but the enclosure it had been living in is what failed, and that enclosure did not accompany it home.
Begin here if yours is doing the same thing.
Other desktop disks on the log.
Yours doing something similar? Power it down first.
Published prices are fixed. Memory cards and USB sticks are £250 + VAT. Any stand-alone drive is £300 + VAT. Drive configurations containing multiple disks (RAID, NAS or server) start at £500 + VAT. First assessments are always complimentary. Thereafter, data recovery charges are also fixed in advance and in writing, so you'll always know how much you owe before paying any money. Shut it down, get a quote first (by phone or with the form), then send it in or drop it off at our Guildford intake laboratory, Monday to Friday, 9am to 5:30pm (no appointment needed). On most jobs you only pay if we recover your data.