Do you need to "eject" USB flash drives?

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Is it necessary to "eject" a USB flash drive before unplugging it from a computer? — Jasper

On Windows, not usually. Obviously, don't remove a drive while transferring data, as you'll corrupt that data, but that's a no-brainer. The main reason for hitting "eject" or "safely remove hardware" is write caching. With write caching on, even if whatever you're transferring is "done," there still may be data hanging out in the cache, waiting for the cue to finish up. Ejecting it sends that message.

But Microsoft has been aware for some time that we like to pop USB drives out at our leisure, so Windows automatically disables write caching for removable flash drives. In Windows 7, if you right-click on a drive and select "Properties," then find it in the "Hardware" tab, then hit "Properties" again (or get there through the Device Manager in a less roundabout way), and head to the "Policies" tab, you can see that "Quick removal" is the default. That ensures that if it says it's done transferring data, it's actually done, and it's safe to remove the drive.

Safe Removal

But be careful. Windows doesn't necessarily disable write caching for external hard drives, so check first—and if there's a lot of important data on it, you may as well be safe and always eject it properly. Even with write caching off, it's possible that data will be tied up with some background process on your PC. On that note, I never recommend working on a file while it's on a removable flash drive—transfer it to your non-removable storage first.

But either way, if I'm ejecting my 1TB external HDD, which I use to backup important stuff I don't want on my main HDD, then yeah, I go through the safe removal process.

The more cautious among us, who would describe frightening stories of damaged cells, will say that you should always, always safely remove any kind of USB drive. My technical advice: Live a little. When it comes to smaller USB drives, I don't bother. It's not like I'm transferring top secret files of which there's only one copy. The worst that might happen is that I corrupt some data and transfer it again, or have to reformat the drive. Not too scary, and if your flash drive ever dies, it probably wasn't because you didn't click "safely remove hardware" every time. Exposure to heat, physical damage, and wear from writing data and plugging/unplugging (USB plugs only last for so long) are far more likely to hurt it. Keep your big external drives safe by safely ejecting them, but there's no need to be nervous about removing a USB stick as long as you've let any transfers complete.


As Executive Editor, Tyler spends a lot of time editing reviews and looking at spreadsheets, and whatever time is left over writing reviews. People joke that he doesn't like 90 percent of the games he plays, but he'll tell you he just has very discerning tastes.
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