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Re: Hard Drive Stops/Starts


 

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This is an observed behavior for some drives, an incompatibility between the drive and the Mac OS, but it could also be bad cable, bad power adapter, or failing drive.?

An external drive may spin up anytime the system checks to see what is available even if you are not directly accessing the drive. For instance, each time you open a finder window or spotlight. Some will spin down fairly quickly. If it¡¯s spinning down within seconds of spinning up, that sounds like a power problem honestly. You might also notice when you connect it for the first time, you¡¯ll hear it spin up, hesitate, spin, stop, then spin all the way to mount. That¡¯s often a failing power supply.?

The most obvious symptom would be if Mac OS gives you the unexpected eject warning when it spins down. That¡¯s a hardware problem, or a severe firmware incompatibility. Believe it or not, there are drives that are buggy with Macs. Rare, but it happens.?

Power supplies are, by far, the most common failure of external HDDs.

Cheers,
???????????????tod

Tod Hopkins
Video Producer?Editor?Technologist?





On Mar 28, 2025, at 4:54?PM, Jim Willett via groups.io <jimwillett@...> wrote:

My external hard drive case is hooked directly to the Mac Mini M4 via USB-c on both ends. I wish the drives would just spin down and stay that way until I access files from one of them. ?However, even if I am just reading on Safari they spin down and seconds later spin up and then down again shortly after that. ?It is annoying. ?I use a Mac Mini M2 at my work place with an external drive. ?That external drive spins down and stays that way until I access something on it. ?
Thanks to everyone who has made a comment about this. ?

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