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OptimUSB is an application that keeps your USB and memory cards optimized.

You just need to run OptimUSB before ejecting your USB drive. Any Mac or Windows temporary files get deleted (.DS_Store, .Trashes, .Spotlight-V100, Thumbs.db, etc.).

OptimUSB then automatically ejects your drive. Now, your USB drive is clean, optimized and ready to be removed safely.

Remember that OS X generates temporary files every time you connect your USB drive. Run OptimUSB each time you eject.

When you delete a file from a USB drive on OS X, it is moved to the trash, leaving a blind copy on the USB drive. You could more...

What's New

Version 6.0.1:
  • Ready for OS X 10.9 Mavericks
  • Minor bugs fix
  • New "About" window with "HamacaSoft" name


  • OS X 10.6.6 or later

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OptimUSB User Discussion

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Mr.EMan Member IconComment+1

This seems to function almost exactly like Eject for Windows, a free program that deletes the hidden file on USB sticks. Having on the menu is interesting, but I've been used to having Eject for Windows on my Dock like the trash. It will clean and eject my disk in one motion.

Reply0 replies
Version 5.0
Andyrogers Member IconReview+24

After transferring photos off my SD card, this app efficiently deletes just those hidden Mac files and ejects the card. Keeps the card working at optimum speed, back in the camera.

Reply1 reply
Version 5.0

.DS_Store files have nothing to do with speed on a SD card.

Dalahast Member IconComment+139

I agree with the other commenters that this is somewhat misleading. Moreover, this can be done for Free if you know a bit of UNIX:

cd /Volumes/[drive name]
rm -Rf .*

Then eject (or use the umount command while you're at it, heh). Note that if your drive's name contains spaces, you'll either need to enclose the whole path in quotes:

cd "/Volumes/name with spaces"

or you'll need to 'escape' the spaces by putting backslashes before them:

cd /Volumes/name\ with\ spaces

(This prevents Terminal from thinking that the spaces are there to separate three arguments: '/Volumes/name', 'with', and 'spaces', letting it know that the spaces are actually all part of one thing instead.)

Reply1 reply
Version 4.1

Also, I have no idea why I capitalized "free" there.

@timi Member IconComment+458

The previous informed comments are all correct. This app DOES NOT "optimize" your flash drive.

This is my vote that MacUpdate change the short description to not use the word "optimize" and that they overrule the developer description and remove any reference of optimization.

TL;DR - App deletes .DS_Store; doesn't optimize storage; misleading description; waste of time.

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Version 4.1
Macnerd1984 Member IconComment+291

No requirement whatsoever to buy this app. If you want to delete DS Files etc. there are plenty of free apps on MU to allow you to do so. $11.99 is a lot of dough for such specific functionality. Homeworld pretty much nailed it in his comment....

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Version 4.0
ModStereo Member IconComment+12

I think everyone below has failed understand the purpose for this utility.

OS X generates these hidden files for thumbnails, folder colours etc and while they are hidden in OSX, they are visible on a windows machine.

This utility is designed to remove these files so the drive is clean for a windows machine.

If you dont use your usb stick on a windows machine, then you dont need this app.

I dont understand why people download software "just to see what it does" and then write reviews not even understanding the programs purpose....

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Version 3.3
Homeworld Member IconReview+72

This isn't optimization. This is deleting some hidden files. Optimization usually refers to rearranging the bits to cluster and defragment files and to cluster and defragment free space -- though how much of a real-world impact that would have on USB memory stick performance anyway (which, remember, this utility doesn't do), is debatable.

Moreover, these tiny files are just going to be recreated the next time one mounts the USB memory device. It's ultimately a futile exercise, since the reclaimed space is only "there" when the device is NOT mounted, and therefore unavailable anyway.

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Version 3.2
Steeps Patrick Member IconReview+114
Steeps Patrick

Doesn't work. It even makes Flashstock slower.

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Version 3.1.1
Arkham6 Member IconReview+62

Not even close to useful. Those temp files are there for a reason and take little space. You can take those 12$ to buy another USB drive, that is what I would do.

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Version 3.1
Shmack Member IconReview+55

Not only is this app not required on Mac OS, but the title and description are highly misleading too. It does NOT optimize e.g. defragment) thumb drives as the title would suggest - it does simply delete a few hidden files that do neither take up any large space nor give away any private information.

Reply0 replies
Version 3.1
user icon+1
Version 2.0
> 5 6


Current Version (6.x)


Downloads 9,727
Version Downloads 524
License Commercial
Date 02 Jan 2014
Platform Intel 64 / OS X
Price $0.99