A 500GB hard drive holds about 465GiB of usable space, enough for roughly 125,000 photos or 125 hours of HD video.
You bought a 500GB drive, plugged it in, and Windows shows 465GB. It’s not broken, and you weren’t ripped off—the math just works differently than the box suggests. Here’s what 500GB actually means and what you can store on it.
Why A 500GB Drive Shows Only 465GB In Windows
Storage makers measure in decimal gigabytes, where 1GB equals 1,000,000,000 bytes. That means your 500GB drive contains 500,000,000,000 bytes of raw space.
Windows and macOS, however, report capacity in binary units where 1GiB equals 1,073,741,824 bytes. Divide 500,000,000,000 by 1,073,741,824 and you get roughly 465.66GiB—the number you see in File Explorer. Microsoft’s own support forums confirm this exact discrepancy.
This gap is expected. The advertised capacity is the drive’s raw decimal size; the reported figure is what the operating system can address after unit conversion. Formatting overhead trims a little more, leaving most users with roughly 460–470GB of visible space.
The same rule applies to SSDs and every storage product sold in decimal gigabytes. A “1TB” drive shows about 931GiB on your PC. Half a terabyte is simply 0.5TB in marketing terms.
What Can You Actually Fit On 500GB?
File counts depend heavily on format, resolution, and compression, but these figures give a practical baseline:
| Content Type | Estimated Capacity |
|---|---|
| Smartphone photos (12MP JPEG) | ~125,000 photos |
| HD video (1080p) | ~125 hours |
| Word documents | ~250,000 documents |
| MP3 songs (4MB each) | ~125,000 songs |
| PC games (50GB each) | ~9–10 games |
| RAW camera photos (25MB each) | ~20,000 photos |
| 4K video (60min = 25GB) | ~20 hours |
A 500GB drive suits light-to-moderate storage: your document library, a decent music collection, and a handful of games. Heavy video editors or gamers with large libraries will feel the limit quickly. Before you buy, check what a new drive costs—our roundup of the best 500GB external hard drives shows what you get at each price point.
What Does A 500GB Drive Cost Today?
New internal 500GB hard drives typically run $15–$60, while external USB-powered portable models land around $35–$90. Retail listings show popular names like the Seagate BarraCuda, WD Blue, and Toshiba MQ04ABF at the budget end, with rugged options like the LaCie Rugged Mini costing more.
Prices shift with condition and interface. Used, refurbished, or bulk listings run cheaper but aren’t comparable to new consumer pricing. USB-C portable models like the WD My Passport Go and SanDisk Extreme cost more than bare internal drives because they include the enclosure, cable, and portability.
One caution: don’t confuse capacity with speed. A 500GB drive’s performance depends on RPM, interface, cache, and drive class—not the size number. A 7200RPM internal model outperforms a portable USB 2.0 drive with the same 500GB capacity.
Common Mistakes To Avoid With 500GB Drives
Three errors trip up most buyers:
- Expecting 500GB usable. The decimal-vs-binary conversion guarantees you’ll see less. Plan around 465GiB, not 500GB.
- Thinking the drive is defective. Showing 465GB means it’s working correctly. The discrepancy is standard across Windows, macOS, and other systems.
- Trusting sample file counts blindly. “125,000 photos” assumes 4MB per image. A 48MP RAW file eats six times that, so your real count drops sharply.
Compatibility also matters more than capacity. A 500GB drive connects via USB-A, USB-C, or an internal SATA port depending on the model—check the interface before buying, not the gigabyte count.