SSD vs HDD in 2026: when a hard drive is still the smarter buy

An SSD keeps data in flash memory chips. A hard drive (HDD) keeps it on spinning magnetic platters. That one difference explains almost everything else about them: an NVMe SSD reads a large file roughly 60 times faster than a hard drive, while a hard drive from Western Digital’s own store costs about half as much per terabyte as the cheapest 2 TB SSD on Crucial’s, and a fraction of what Samsung charges. Which one you should buy depends on the job. We compared the two on speed, price per terabyte, endurance, reliability, noise and power, using the makers’ spec sheets, their store prices as checked on 28 September 2026 and the latest Backblaze failure data. There are more cases than you might expect where the hard drive is still the smarter buy.

How each one works

A hard drive is a stack of platters spinning at 5,400 to 7,200 revolutions a minute, with a read/write head floating over each surface. To fetch a file, the head has to swing to the right track and then wait for the right sector to come round underneath it. That mechanical wait takes a few milliseconds. It’s why a hard drive can stream one big file quite happily but crawls the moment a program asks for thousands of small pieces scattered across the disk.

A solid-state drive has nothing that moves. Data sits in NAND flash cells and a controller can address any of them in microseconds, which is how you end up with a 60-fold gap on sequential reads and a gap of thousands of times on random access. The connection matters as well. A SATA SSD such as Samsung’s 870 EVO is capped by the SATA bus at 560 MB/s, a PCIe 4.0 NVMe drive can reach about 7,400 MB/s, and the PCIe 5.0 drives launched since 2025 are rated close to 14,900 MB/s.

Speed on the spec sheets

All the figures below are the manufacturers’ own “up to” ratings, taken from their datasheets and product pages, for the 2 TB models unless we say otherwise. We haven’t benchmarked these drives ourselves. Random performance is given in IOPS (input/output operations per second), and that is the number that decides how snappy a computer feels.

Drive	Type	Sequential read / write	Random read	Endurance rating	Warranty
Samsung 9100 PRO 2 TBMZ-VAP2T0B/AM	PCIe 5.0 NVMe	14,700 / 13,400 MB/s	1,850K IOPS	1,200 TBW	5 years
WD_BLACK SN8100 2 TBSandisk datasheet	PCIe 5.0 NVMe	14,900 / 14,000 MB/s	2.3M IOPS	up to 4,800 TBW (8 TB)	5 years
Samsung 990 PRO 2 TBMZ-V9P2T0B/AM	PCIe 4.0 NVMe	7,450 / 6,900 MB/s	1,400K IOPS	1,200 TBW	5 years
Samsung 870 EVO 2 TBMZ-77E2T0B/AM	SATA SSD	560 / 530 MB/s	98K IOPS	1,200 TBW	5 years
Seagate IronWolf Pro 24 TBST24000NT031, 7,200 rpm	HDD, NAS	240 MB/s sustained	not rated	550 TB/year workload	5 years
WD Red Plus 8 TBWD80EFPX, 5,640 rpm	HDD, NAS	215 MB/s	not rated	180 TB/year workload	3 years

Two things in that table matter more than the headline speed. One is the random column. Neither hard drive maker publishes an IOPS figure for these drives, whereas the SSDs are rated in the millions, and that is the gap you actually feel when Windows boots, a game loads a level or Lightroom builds previews. The other is power. The PCIe 5.0 drives double the sequential rating of the 990 PRO, but Samsung’s own datasheet shows the 9100 PRO drawing 8.1 W on reads against 5.8 W for the 990 PRO. Extra speed means extra heat, which is why PCIe 5.0 drives are usually sold with a heatsink, or on the assumption that you’ll fit one.

Price per terabyte

We only quote prices from the manufacturers’ US web stores, all checked on 28 September 2026. Two of them gave us nothing usable. Seagate’s US store showed its IronWolf Pro and BarraCuda pages as “no longer in stock” with no price, and Sandisk’s store, which now sells the WD_BLACK and WD Blue SSDs, listed them as not purchasable online with no guest price. So the SSD side of this comparison rests on Samsung and Crucial, and the hard drive side on Western Digital.

The spread inside the SSD column is striking. Crucial’s PCIe 5.0 T705 costs less than half what Samsung asks for its PCIe 4.0 990 PRO at the same capacity, and Samsung’s SATA 870 EVO, the slowest drive in this article, is the most expensive per terabyte of the lot. Shop around before paying Samsung’s list price. Even at Crucial’s prices, though, a terabyte of SSD costs roughly double a terabyte of NAS hard drive, and the gap widens as capacity grows. WD sells a 12 TB Red Plus for less than Samsung asks for 2 TB of 990 PRO.

Endurance and reliability

Flash cells wear out as they are written to, so every SSD carries a terabytes-written (TBW) rating, and the warranty ends at that figure or at five years, whichever comes first. Samsung rates both its 2 TB 990 PRO and 2 TB 9100 PRO at 1,200 TBW. Crucial rates the 2 TB T705 and T710 at 1,200 TBW and the cheaper P310 at 440 TBW, and Sandisk rates the 8 TB SN8100 at 4,800 TBW. To get through 1,200 TBW in five years you would have to write about 650 GB every single day. For a normal user, write endurance isn’t what kills an SSD.

Hard drives use a different measure, the annual workload rate, which counts reads as well as writes. WD rates the Red Plus at 180 TB a year with a 1 million hour MTBF; Seagate rates the IronWolf Pro at 550 TB a year with a 2.5 million hour MTBF and throws in three years of its Rescue data recovery service. Those are limits for drives running 24 hours a day in a NAS, not a countdown. They fail differently too. Bearings, motors and heads wear, and a failing hard drive usually starts reporting reallocated sectors or slowing down before it dies. An SSD controller tends to go all at once.

The best public reliability data comes from Backblaze, a cloud storage company that publishes failure rates for every hard drive model in its data centres. Its Drive Stats report for Q1 2026, published on 9 July 2026, covers 341,263 hard drives and gives a quarterly annualised failure rate (AFR) of 1.24 percent, up from 1.13 percent the previous quarter but down from 1.42 percent a year earlier. The lifetime AFR across 529,968,464 drive-days is 1.39 percent, and the full-year 2025 figure was 1.36 percent, down from 1.55 percent in 2024. Individual models vary a lot. In Q1 2026 Toshiba’s 24 TB MG11ACA24TE sat at 0.22 percent and WD’s 22 TB WUH722222ALE6L4 at 0.38 percent, while Seagate’s 24 TB ST24000NM002H was at 3.29 percent.

Noise, power and heat

A hard drive is audible and an SSD is silent. Seagate’s datasheet for the 24 TB IronWolf Pro gives 28 dBA at idle and 32 dBA while seeking, which is quiet for a 7,200 rpm drive but still an audible hum in a quiet room, and four of them in a NAS make more noise than one. Power is less clear-cut than you might expect. The same IronWolf Pro draws 6.7 W idle and 7.8 W operating. Samsung’s 2 TB 9100 PRO draws 8.1 W on reads and 7.9 W on writes, so the fastest SSD here uses as much power as a big hard drive while it’s busy. Where they part company is at idle. The SSD drops to 4.8 mW in its sleep state, more than a thousand times less than a spinning platter, and that is one big reason laptops moved to flash.

PCIe 4.0 and SATA SSDs sit in between. The 2 TB 990 PRO is rated at 5.8 W read and 5.1 W write, the 2 TB 870 EVO at 2.2 W read and 2.5 W write. Sandisk makes power efficiency the main pitch for the SN8100, claiming more than 100 percent better efficiency than its PCIe 4.0 drive at an average operating power of 7.5 W or under, with 6.5 W read and 7.0 W write on the 2 TB model. In practice, a PCIe 5.0 drive in a small case with no airflow will throttle and a PCIe 4.0 drive won’t.

Where a hard drive still wins

Three places. Bulk storage first: a photo and video library, a media server, a NAS. Once you need more than about 4 TB, the SSD premium runs into thousands of dollars, and a hard drive’s 200 to 240 MB/s is plenty to stream 4K video to several rooms at once. Then backups. A backup drive gets written occasionally and read rarely, so speed doesn’t matter, and magnetic platters hold data without power for years, whereas flash cells slowly leak charge in a drawer. And finally capacity per bay. Seagate sells the IronWolf Pro up to 32 TB in a single 3.5-inch slot. Samsung’s and Sandisk’s flagship M.2 lines top out at 8 TB, and Samsung’s 8 TB 9100 PRO was $2,719.99 on its store.

What we would buy

For a laptop there’s no decision to make about the type. The drive is an M.2 NVMe SSD, and all you need to settle is the capacity and whether the slot takes the full 2280 length or the shorter 2230 size used in thin machines and handhelds; check the manual. Go for a PCIe 4.0 drive. PCIe 5.0 draws more power than most laptops can cool or feed.

For a desktop, put the operating system and programs on a 1 or 2 TB NVMe SSD and only add a hard drive if you store more than a few terabytes of media. If your board has a PCIe 5.0 M.2 slot and you regularly copy files of tens of gigabytes (video projects, disk images, AI model weights), a T705, T710, 9100 PRO or SN8100 can halve those copy times. For everyone else, a 990 PRO or P310-class drive is the sensible buy.

For a NAS, buy drives sold for the job: WD Red Plus or Seagate IronWolf. They use conventional magnetic recording (CMR), carry workload ratings and are built to cope with vibration in multi-bay boxes. A NAS reaches the rest of the house through your router, and a gigabit Ethernet port tops out at about 125 MB/s, below what one of these drives can deliver; the 2.5 Gbps ports we cover in our guide to modems and routers lift that limit if the NAS has one too. Run two or more in a mirrored or parity array and keep a separate backup, because an array protects you against a dead drive and nothing else. If the files you want to protect are on a phone, our guide to backing up an Android phone covers copying them to a PC or a USB-C drive.

Verdict

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