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To download Disksomnia from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Learn More.


By Digital Heaven Ltd

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Waiting for sleeping disks to wake up can be a frustrating experience for DJs, video/audio editors, musicians, and motion graphics designers who frequently work with media files located on multiple disks.

Disksomnia 4.0 periodically writes a file to keep any local disk awake, including those that stubbornly ignore Energy Saver preferences.

- Disksomnia now runs as a menu bar app with extremely low overhead and easy access to Preferences.
- By default, Disksomnia will write to disks every 55 seconds but you can now set a custom period (up to 999 seconds) to suit your particular disks.
- Icon animates when disks are being written to and there’s a countdown indicator to the next write.
- Easily select which disks are kept awake.
- Disksomnia can run all the time or only when selected applications are running. Perfect if you only need disks to be kept awake when editing audio or video.

What's New in Version 4.0.3

- Fixed menu bar icon not showing on OS X 10.7 Lion.


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Customer Reviews

Works great.

I have a USB3 external SSD that kept sleeping, and disconnecting from my Mac. Disksomnia seems to have fixed this. I have had it running for several hours so far, and I have received no disk ejected notices. The drive would disconnect every few minutes, and then reconnect if I wasn’t actively using the data on it. It seems that all that was needed was something to keep it busy.

Fingers Crossed

I installed this app on a gamble to see if it would help resolve the chronic, long-standing Mac OS issue of disappearing external USB drives. I use three (3) USB drives attached to my 2015 iMac, one of which is my Time Machine. Thanks to Mac’s unresolved inability to keep external drives attached and visible, they were usually useless to me. Worse, I had no Time Machine backups available. From the forums, I discovered that many thousands of others have the same issue with their Macs, so out of frustration, I decided to start trying new ways of dealing with the problem. In so doing, I ran across Disksomnia, and while it didn’t claim to address the specific issue of disappearing drives, it did claim to keep drives from going to sleep, which many suspect is the reason Mac OS “loses” track of external hard drives.

Well, to summarize — I installed Disksomnia, reconnected my 3 USB drives, and so far they haven’t disappeared again. It’s only been 24 hours, but the iMac has been put to sleep and awakened several times, and the drives still show up on my desktop and in Finder. In the past, I would have “drive improperly disconnected” warnings and the drives would be nowhere to be found on my desktop or in Finder. So far, so good. If there’s any change I will post an update if I can. If you experience unexplained drive disconnects in Mac OS, this might solve the problem for you.

UPDATE: After 3 days all of my external disks are still attached and working, including Time Machine. I still get “disk disconnected improperly” messages when the iMac wakes up, but all of the disks are still there. Someday Mac OS X may eventually fix the external drive problem, but for now, this looks like a workaround.

View in Mac App Store
  • $9.99
  • Category: Utilities
  • Updated:
  • Version: 4.0.3
  • Size: 1.7 MB
  • Language: English
  • Seller:

Compatibility: OS X 10.7.3 or later, 64-bit processor

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