How Much Storage Do I Need? 5TB vs 4TB vs 6TB | Matching Drives to Real Use

Choosing between 4TB, 5TB, and 6TB comes down to one honest question: what are you actually storing? A 4TB drive holds roughly 80 full-length movies or around 400,000 photos; a 5TB drive adds about 20 more movies of headroom. The bigger capacities only make sense when your library genuinely outgrows the smaller ones.

Here’s the practical breakdown for local files, backups, and gaming, with the real current products and prices.

4TB: The Practical Baseline

4TB is the entry point for serious storage. It handles a large photo library, a full music collection, and years of documents without stress. Western Digital offers the easystore Portable HDD in 4TB, 5TB, and 6TB capacities, and Seagate’s Basic Portable Drive lists a 4TB model (STJL4000400).

If your current drive is 1TB or 2TB and nearly full, 4TB gives you breathing room without paying for capacity you won’t touch for years. It’s the right call when you want a single reliable backup of a main computer.

5TB: The Sweet Spot for Most People

5TB is where the value lands. The math is simple: it costs only slightly more than 4TB but gives you 25% more space. Current products include Seagate’s Expansion Portable Hard Drive 5TB, the Seagate Portable Hard Drive 5TB, and the One Touch HDD 5TB (model STKC5000404). Western Digital’s easystore also comes in 5TB.

For a family that backs up two laptops, keeps a game library, and stores years of photos, 5TB is the volume that makes the “almost full” warning stop appearing. It’s also the capacity where portable drives are most widely available, so you have more model choices.

6TB: Worth It Only for Large Libraries

6TB is the premium tier, and it’s only worth the extra money when a 5TB drive would leave too little headroom. If you have a large media collection, multiple computer backups, or you’re consolidating several older drives into one, 6TB avoids the hassle of managing two drives. Western Digital’s easystore is currently offered in 6TB.

The catch: 6TB portable models are less common than 5TB, and the per-gigabyte price is usually higher. For most personal use, 6TB means paying for space you won’t use for several years.

Games, Macs, and Cloud Plans: Capacity Caveats

Use case changes the answer. For PlayStation owners, consider the storage capacity needed for modern game installs that routinely exceed 100GB each.

Here’s a quick comparison of what these capacities actually hold for different jobs:

Gaming is a separate story. A Seagate Game Drive 5TB for PS5 runs about $219.99 and holds “60+ PS5 games or 100+ PS4 games,” according to PlayStation Direct. That’s a compatibility-specific product, not a general-purpose drive, so don’t buy it expecting to use it as a standard backup drive.

Mac users face one extra check. Western Digital’s easystore supports Windows 10 and newer out of the box; for macOS 11 and later, you’ll need to install WD’s downloadable NTFS driver to get read/write access without reformatting the drive. Skip that step and the drive works read-only on a Mac.

And don’t confuse physical drives with cloud plans. Apple’s iCloud+ offers a 6TB tier for $32.99 per month, but that’s a subscription, not a hard drive. Cloud storage solves different problems — syncing between devices and offsite protection — while a physical drive gives you one-time-cost, always-available local capacity.

Which Should You Buy?

Choose 4TB if you need a single reliable backup and won’t accumulate much more. Choose 5TB if you want room to grow without overpaying — for most people, this is the right answer. Choose 6TB only if you already know your collection is large and a 5TB drive would fill up within a year.

Before you buy, check port compatibility: Seagate’s portable models use USB 3.0/USB 3.x interfaces, which work fine on older computers and hubs but top out at around 5Gbps speeds. Also note that Seagate’s One Touch HDD carries a 2-year limited warranty, and the same warranty applies to WD’s easystore, so consider that coverage window when comparing prices.

Ready to compare actual models? Our tested roundup of the best 5TB external hard drives covers current picks and real-world performance.