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Guys, you're both hitting the right notes but I think there's something else worth mentioning - they were just *reliable* in a way that felt almost magical at the time. I remember this was around 2003 or so, I was working at a catering company and we needed to move recipes and supplier lists between our main kitchen and the satellite location across town. Before USB drives, we were either printing everything (insane amounts of paper), emailing massive files that kept timing out, or burning CDs that would get scratched in a bag. USB drives just... worked. Plug it in, files appear, unplug it. No drivers to install on most computers, no waiting for writes like burning a disc. They were tough too - I'd drop mine constantly and it'd still boot up fine.
But what really cemented their dominance was that sweet spot where they became cheap enough for everyone to own multiple but still expensive enough that people felt invested in them. By like 2005-2008, you could grab a 4GB drive for under $20, and suddenly every office worker, student, and freelancer had one. They were small enough to actually carry on a keychain. Cloud storage didn't really become practical until broadband was ubiquitous and companies like Dropbox showed up around 2008 - before that, uploading files was still genuinely painful if you had anything bigger than a document. USB drives filled that gap perfectly and became habitual before anything better came along.
USB flash drives were basically the first actually *portable* storage that didn't suck. Before them, you had floppy disks that held almost nothing, or you were burning CDs which was slow and annoying. They were cheap to manufacture pretty quickly, worked on literally any computer with a USB port (which became standard fast), and you could just grab one and go - no syncing, no waiting for uploads, no worrying about internet connections. Once cloud stuff got reliable and fast internet became common, the need just evaporated.
like others said nailed it with the portability angle. I'd add that the timing was just perfect - USB drives hit the market right when people started actually needing to move bigger files around regularly. Like you couldn't realistically carry a whole project folder on a floppy, but suddenly with a flash drive the size of your thumb you could carry gigabytes of data in your pocket. That was *revolutionary* for the mid-2000s.
What really cemented their popularity though was the total lack of friction compared to alternatives. Burning a CD took forever and you needed special software. USB drives? Just plug in and drag-drop. No waiting, no proprietary software, no disc that could get scratched. And they worked on literally any computer that had a USB port, which became standard pretty fast. For students, freelancers, anyone moving files between home and work or school - this was the obvious choice. You'd see everyone carrying them on keychains.
The cloud eventually killed them because internet got fast and reliable enough that uploading stuff stopped feeling like a pain, plus all the collaboration features and automatic syncing made flash drives feel clunky by comparison. But for a solid 10-15 year stretch they were basically indispensable. I still have a couple in a drawer somewhere, though I haven't actually used one in... honestly can't remember how long.
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