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TOPIC: 3.5 HDD 5V sensor failued

3.5 HDD 5V sensor failued 29 Mar 2015 14:19 #6299

My iMac (21.5 in, Late 2103; 2.7 GHz Intel Core i5, 16 GB RAM( started misbehaving this morning, with external 2 USB hard drives ejecting spontaneously. When I attempted to restart, the iMac hung on the exit process with the gear wheel spinning for over 2 minutes. I then shut down the computer and restarted. Startup was slower than usual. I then booted from a cloned external Seagate 2TB hard drive and ran:

Disk Utility:
Disk repair showed no problems.
Repair permissions showed the following error:
Warning: SUID file “System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAgent” has been modified and will not be repaired."

When I ran TTP 8.0.1, it reported the following Sensor Test failure:
Voltage - 3.5 HDD 5V 0.00 V Failed.
The iMac passed all other tests.

What does this sensor test mean?
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3.5 HDD 5V sensor failued 29 Mar 2015 16:38 #6300

The sensor test is new, and there is going to be a bit of a learning curve on interpreting the results, beyond what is on page 5.17 of the manual. You can get a more detailed explanation by sending a message to This email address is being protected from spambots. You need JavaScript enabled to view it. . You will receive a reply by email on Monday, and may be asked to send in an Apple System Information report.

Based on what you posted, it appears that a sensor is reporting a 0.00 volt reading when a reading of 5 volts was expected. My own hard drives are not supported by the test, so I cannot see just what the normal result should be. I doubt that the drive could work if a voltage that should be 5 volts was in fact zero volts, but even a possible inability to read the actual voltage when a sensor is present does suggest that there may be something wrong with the drive or the port or cable to which it is connected.
MicroMat Inc
Makers of TechTool
Last Edit: 29 Mar 2015 16:43 by micromattech3.
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3.5 HDD 5V sensor failued 05 Oct 2017 01:11 #8670

This is the same error that occurred to me - the only sensor failure, saying 3.5 HDD 5V 0.00 V FAILED

Testing my 21.5" late 2013 iMac 2.9 GHz i5 with 16GB RAM (same specs I believe).
Running OS 10.9.5 (Mavericks), and using TTP 9.5.3

Performing a general health check after discovering an isolated virus file in Mail archives, and removing.

NOT the main trouble I am trying to diagnose however - the problem is with several Seagate external USB 3 drives which have sporadically and spontaneously "lost" their Mac formatted HFS+ directories and the drive/s always revert their names to 'My Book'. Data is still present and can be recovered using deep scans with specialist data recovery programs - but it is a lengthy process each time, dealing with disks of 4TB, 5TB and 8TB - and where to store the retrieved data! This is a separate topic in its own right and I have already addressed the issue with Seagate, who cannot give me a definitive answer or solution - replacing the drives under warranty is a possibility, but the problem points to some other condition or situation that is happening; maybe there is rf interference with 2.4GHz wifi, or maybe i'm being hacked??
It was interesting to note that the original poster also mentioned Seagate external drives, and they appeared to be experiencing problems too.

Do you say what OS you are running? I don't know if updating to latest OS will have fixes to resolve these issues, but i'm reluctant to update because I am using older Adobe CS 5.5 Suite and don't want to lose usability if it doesn't happen to be compatible with the later OS's - you typically update one aspect of your software and suddenly everything else becomes incompatible!?
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3.5 HDD 5V sensor failued 05 Oct 2017 01:29 #8671

Thanks for your clear and detailed report.

I do not have anything to add to what I wrote above about the result from the sensor test. The drive clearly cannot operate with zero volts. If you send a message to This email address is being protected from spambots. You need JavaScript enabled to view it. , you may be able to get some more details about why this result is being reported.

What I find really interesting and alarming is the loss of directory data you have reported, and your mentioning the fact that so far, Seagate does not have a solution. If external electrical interference were the source of the problem, one would think that directly connecting the drive with the shortest practical cable (preferably one well-insulated, such as the ones Granite Digital sells) might help.
MicroMat Inc
Makers of TechTool
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3.5 HDD 5V sensor failued 07 Oct 2017 03:09 #8674

I discovered the module in TTP9 that says 'Partition Repair' and so attempted to use that on one of my problem drives - I was getting it to analyse my Seagate 8TB USB 3 expansion drive and hub which was the disk I was currently using as my Time Machine backup. After a few hours it began having problems with the OS telling me it was out of memory to perform the operation - Force eject window was opening and letting me know every program running was not responding; even when trying the operation again with solely TTP running (and Finder) it would soon come up against this problem - I could click on the program required (TTP) in the list and I could click Resume button, but it was clear the computer was struggling to carry out the scan - it was still just on the first stage of the Partition Repair. Is it just that trying to scan such a large volume using an iMac with merely 200GB free space is rather impossible? I would have thought the process would still have been able to swap in/out memory and carry out the process in stages? - TTP does not give feedback as to how long the procedure is likely to take, only counts how long it has been running already.
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3.5 HDD 5V sensor failued 07 Oct 2017 03:11 #8675

Sorry, I have probably hijacked this thread and diverged from it's original topic - maybe should have started a new topic?
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3.5 HDD 5V sensor failued 07 Oct 2017 03:54 #8676

Just found a very useful article here:
www.cnet.com/news/external-drives-experi...ericks-installation/

This is the OS I have at present.
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3.5 HDD 5V sensor failued 07 Oct 2017 12:28 #8677

Repairing a partition map usually takes less than one minute. If it takes longer, it is possible that the blocks on the drive that hold the partition map have gone bad since the volumes on the drive mounted, or that the blocks to which the computer is attempting to write are bad blocks and are not being remapped to spare blocks in real time.

Please run the Surface Scan to examine the drive.

I suggest that you restart the computer, and, on a drive on which you can afford to lose data, such as a small USB memory stick containing only files that you also have elsewhere, you try to repair the partition map, just so you can see how quickly it goes. A large drive with large volumes can have very large disk directory files (Catalog B-Tree and Extents B-Tree), but no partition map is very large. It is simply a list of the volumes on the drive, where they begin and end, and some of their characteristics.
MicroMat Inc
Makers of TechTool
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3.5 HDD 5V sensor failued 07 Oct 2017 12:30 #8678

Thanks for posting the link to the interesting CNET article.

People often forget that drives that come with proprietary software could have new versions of that software, and that any drive might have a firmware update. We have recently noted that SSD drives that need a firmware update often give puzzling or erroneous S.M.A.R.T. test results that do not arise with the updated firmware.
MicroMat Inc
Makers of TechTool
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