You should always eject your flash drive and 3 other USB storage myths we need to kill

Published Oct 7, 2026, 2:30 PM EDT Ismar is a Senior Author at How-To Geek. He previously worked as a writer, editor, and general manager at a content agency before joining the team in 2023. He began his writing career in 2021 after completing a BA in English Language and Literature. Beyond How-To Geek, Ismar has contributed to Red Stag Fulfillment and Authority Hacker. He has also worked on various SEO projects to help clients improve their search visibility. Ismar has been around Windows PCs since the age of three, so friends and family naturally chose him as the resident tech support. His projects often involve tinkering, such as disassembling mechanical keyboards and gaming mice to mod his beloved gear. He also enjoys pushing hardware to the max through overclocking while staying on a reasonable budget. An avid gamer, Ismar has logged thousands of hours across various genres, including first-person shooters, RPGs, racing games, and roguelites. When he is not at his desk, he is probably exploring other people’s phones to discover their quirks and features or experimenting with the latest AI tools. In his free time, Ismar enjoys spending time with his wife, working out at the gym, playing guitar and bass, cooking gourmet meals, and traveling. Above all else, he’s a proud cat owner. Back in the day, pulling a USB flash drive out of your PC without safely ejecting it was a surefire way to get yelled at by a parent or techie friend. And they were right — removing a flash drive without safely ejecting it could interrupt pending transfers, corrupt files, and potentially leave the drive unusable without reformatting. Thanks to modern versions of Windows changing how USB drives are handled, that ritual is largely a thing of the past. But there are still plenty of other USB flash drive myths that folks believe. Many of them sound reasonable at first, but when you dig deeper, you'll often find that they're simply misinterpretations of facts. You must safely eject a USB flash drive before pulling it out The rules have changed, though not for all Back when USB flash drives first started appearing and becoming mainstream in the early and mid-2000s, ejecting a USB flash drive before physically unplugging it was mandatory. Many of us who felt rebellious intentionally didn't unplug the USB to see what would happen but would eventually be humbled with an inaccessible file. This has to do with how earlier versions of Windows handled USB drives, and it all has to do with a feature called write caching. Instead of writing data directly on the USB, a PC would store temporary data in the RAM, which sped up file transfers and, more importantly, made the visual progress indicator move and disappear more quickly. However, the writing operation actually took a few seconds longer after the window was closed. Clicking eject gave Windows a heads-up warning that it needs to dismount the drive, and it would notify you when the drive was safe to be removed. Skipping this step was actually pretty risky. Think about it: you typically unplug a flash drive when you're done transferring files, but if Windows hasn't actually completely finished the operation, you were at a very real risk of corrupting your files. While Mac OS and Linux still use write caching on USB flash drives by default and require you to eject before unplugging, Windows changed the default behavior starting with Windows 10 version 1809. Instead of prioritizing performance, quick caching is disabled by default. Windows runs each flash drive in what it calls "Quick Removal" mode. Data is written directly on the drive, allowing you to unplug the drive at any moment without having to eject it. It's worth noting that write caching can be re-enabled in Device Manager, in which case you'd actually have to eject it before removing it (which is why the option still exists). But if you don't care about performance and haven't configured Windows, you'll be just fine if you just unplug the drive. A USB flash drive can store your data forever Flash has an unexpectedly short shelf life Credit: Ismar Hrnjicevic / How-To Geek While it's easy to think of flash drives as the perfect, low-investment backup storage, they're actually a poor choice for storing data long-term. And it gets especially risky as the drive ages and remains unplugged for long periods. To understand why you should never rely on a flash drive as your only backup, it helps to understand why they can lose data. As their name suggests, USB flash drives use NAND flash memory for storage, just like SSDs. Flash memory stores data by trapping electrical charge inside memory cells, where an insulating layer keeps that charge contained. While this insulation can keep the charge inside for a long time, it isn't permanent. The charge can slowly leak over time, eventually making it harder for the drive to distinguish between the different states used to represent data. If enough errors accumulate, you're facing corrupted or unrecoverable files. How long this process takes depends on numerous factors, including the type of NAND memory, how much the drive has been used, and where you keep the drive. A magnet can delete everything on your USB flash drive This isn’t a floppy disk Before USB flash drives became the go-to portable storage medium, floppy disks were everywhere. And you were probably told at some point that you should never keep them close to a magnet, as this could delete or corrupt the data. This is because floppy disks used a magnetic coating to store data by orienting magnetic particles to represent 0s and 1s, an arrangement that could easily be disrupted by a strong magnetic field. While a magnet will be attracted to a flash drive's metal USB connector, it can't harm the data stored on its solid-state flash memory. It uses the aforementioned floating-gate transistors to store data rather than magnetic particles, so there's simply nothing for the magnet to scramble. You should use all the space your USB drive has Flash needs some breathing room Credit: Jason Fitzpatrick / How-To Geek While it's tempting to fill up the whole 128GB of the flash drive you paid for, it's not the best practice. Like SSDs, USB flash drives require some amount of free space for internal processes such as wear leveling and garbage collection. The flash drive may need to shuffle data around its memory blocks to maintain performance and long-term durability, so it needs some space to work with. There's no single universal number for how much space to leave, but keeping around 10–20% free is a fairly safe bet for most drives. USB flash drives are more complicated than they seem It's easy to take USB flash drives for granted, but there's some seriously clever technology packed into these tiny devices. They can cost just a few bucks, yet they use sophisticated flash memory and controllers to store gigabytes of data on something small enough to hang from your keychain.