If you’re building or upgrading a PC in 2024, the real question isn’t “HDD or SSD” anymore, it’s whether you need a hard drive at all. PCIe SSDs (NVMe drives that plug straight into the motherboard) have gotten cheap enough that for most people, a hard drive is only worth buying for bulk storage. Here’s the actual breakdown, with numbers.
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Speed: there’s no contest
A 7200RPM hard drive reads and writes sequentially at roughly 150-220 MB/s. Random access (opening lots of small files, loading game textures, booting an OS) is where it really falls apart, often down in the single-digit MB/s range because the drive has to physically move a read head around a spinning platter. That mechanical seek time, typically 8-12ms, is the bottleneck.
A PCIe 3.0 NVMe SSD does 2,000-3,500 MB/s sequential and has access latency measured in microseconds, not milliseconds. PCIe 4.0 drives push 5,000-7,500 MB/s, and PCIe 5.0 drives are now hitting 10,000-14,000 MB/s. In practice this means Windows boots in 8-12 seconds instead of 30-45, and a 50GB game installs in under a minute instead of 8-10 minutes.
Price per gigabyte
This is the one place HDDs still win, and it’s not close. A 4TB hard drive runs about $75-90, roughly $0/GB. A 4TB PCIe SSD costs $200-280, around $0/GB. At 8TB and above HDDs stay cheaper still, often under $0.015/GB, while SSDs at that capacity get expensive fast and QLC-based large drives start showing weaker sustained write performance.
For a NAS, a media server, or a backup drive where you’re storing terabytes of video or archives you rarely touch, that price gap matters more than speed. If you’re shopping for bulk storage, it’s worth comparing a few 4TB internal hard drives against SSD pricing before assuming you need solid state everywhere.
Side by side
| Factor | 7200RPM HDD | PCIe NVMe SSD |
|---|---|---|
| Sequential speed | 150-220 MB/s | 2,000-14,000 MB/s |
| Random access latency | 8-12 ms | 0.02-0.1 ms |
| Price per TB (approx.) | $20-25 | $50-70 |
| Max common capacity | 22TB+ | 8TB (consumer) |
| Shock/vibration risk | High (moving parts) | None (no moving parts) |
| Idle power draw | ~5-8W | ~0.05-2W |
| Typical lifespan | 3-5 years | 5-10+ years (TBW dependent) |
How each one actually dies
Hard drives fail mechanically. Bearings wear out, read heads can click and fail (the infamous “click of death”), and physical shock from a drop can cause a head crash that scratches the platter and makes data unrecoverable. They’re also more sensitive to heat and vibration over long periods, which is why laptop HDDs historically failed more than desktop ones. Backblaze’s annual drive stats, drawn from tens of thousands of drives in their data centers, consistently show annualized failure rates around 1-2% for drives under 4 years old, climbing noticeably after that.
SSDs fail electrically. NAND cells wear out after a finite number of write cycles, which is why drives are rated in TBW (terabytes written) rather than just years. A typical 1TB consumer NVMe drive might be rated for 300-600TBW, which for a normal desktop user (not constantly rewriting large files) translates to well over a decade of realistic use. The more common failure mode in practice is the controller or firmware, not the NAND itself, and it tends to happen suddenly rather than with warning signs. HDDs often give you SMART warnings or audible clicking before they go. SSDs usually don’t.
Which one you actually need
For your boot drive, OS, and anything you want to feel fast, there’s no real debate: get an NVMe SSD. Even a budget PCIe 3.0 drive will transform a system that’s currently running on a hard drive. If you’re assembling a new build or doing a storage upgrade, browse 1TB NVMe SSDs as your starting point, that capacity covers Windows plus a handful of games or applications comfortably.
Hard drives still make sense in three cases: bulk cold storage where price per gigabyte matters more than speed, NAS setups where you need many terabytes across multiple bays, and backup targets you don’t access often. If you’re outgrowing your current setup and mainly need more room for files rather than faster load times, a basic external drive from a range of external hard drives for backup is the cheaper, perfectly adequate answer. Don’t feel pressured into an SSD for that job, the money is better spent on your primary drive instead.
The practical setup most people land on: a 1TB or 2TB NVMe SSD for the OS and everyday programs, plus a hard drive if and when you actually run out of space for media or archives. You don’t need to pick one technology for the whole system, and for most builds you shouldn’t.
