Samsung 870 QVO 2TB 2.5-inch SATA SSD: features, specs and who it suits

The Samsung 870 QVO (model MZ-77Q2T0B) is a 2TB internal solid state drive in the standard 2.5-inch SATA format. It is aimed at people who want to add capacity to, or replace the drive in, a desktop PC or laptop that still uses a SATA drive bay. Here is what its specifications mean and what to confirm before fitting one.

What QLC flash means for a drive like this

Samsung describes the 870 QVO as its second-generation QLC SSD. QLC flash stores four bits in each memory cell, which typically allows more capacity per chip than the TLC flash used in many faster drives. The usual trade-off is that sustained writes can slow down once a drive's fast write buffer is full, and endurance figures are lower than on drives with fewer bits per cell. Samsung says the 870 QVO improves random access speed and sustained performance over its predecessor, the 860 QVO, and quotes gains of up to 13% in queue-depth-1 random reads and up to 21% in sustained writes.

Understanding the speed figures

The listing gives sequential read and write speeds of up to 560 and 530 MB/s. Those numbers sit close to the ceiling of the SATA III interface, which is limited to roughly 600 MB/s in practice by its 6 Gb/s link. That is why SATA drives from different makers tend to quote similar figures, and why they are noticeably slower than NVMe drives that connect over PCIe.

For everyday computing, such as booting, opening applications and moving documents or photos, a SATA SSD is typically a large step up from a mechanical hard disk. Samsung also says the drive works with older SATA 3 Gbps and 1.5 Gbps ports, though speeds would then be limited by the port. Samsung notes that performance may vary with firmware, system hardware and configuration.

Capacity, endurance and warranty

The 870 QVO range comes in 1, 2, 4 and 8TB sizes. Endurance is expressed as TBW, or terabytes written, the total amount of data the warranty covers. Samsung's endurance figures scale with capacity, and its warranty is described as limited, lasting up to three years or up to the TBW figure for that capacity, whichever comes first. Check the warranty statement packed with the drive for the exact figure for the 2TB model. For typical home and office use, the amount of data written over the years is usually far below these limits.

As with all drives, the capacity shown in the operating system is a little lower than the label, because manufacturers count 1GB as one billion bytes and some space is used for system and maintenance purposes.

Fitting it into a desktop or laptop

The drive uses the 2.5-inch, 7mm form factor, which suits most laptops and many desktops, either in a 2.5-inch bay or in a bracket adapter in a 3.5-inch bay. It connects with a SATA data cable and, in desktops, a SATA power connector. Many people clone their existing drive to the new one, or install the operating system fresh. Samsung's Magician software is offered for monitoring drive health, updating firmware and managing the drive.

Who it suits

It suits owners of older desktops and laptops that have no M.2 slot, people replacing a hard disk, and anyone building a bulk-storage drive for games, photos or media where capacity matters more than top-end speed. It is less suited to workloads that write very large amounts of data continuously, or to systems with a fast NVMe slot free, where an NVMe drive would use the extra bandwidth.

What to check before you buy

• Interface and bay: confirm your device has a 2.5-inch SATA bay or an adapter, not only an M.2 slot.
• Type of M.2: if your laptop uses an M.2 slot, check whether it accepts SATA or NVMe drives, since this drive is neither.
• Cables and power: desktops need a free SATA data port and power connector.
• Cloning or fresh install: decide how you will move your data, and back it up first.
• Workload: think about how much data you write daily and whether QLC endurance suits it.
• Warranty terms: read the TBW and time limits for the 2TB size.

The short version

• A 2TB, 2.5-inch, 7mm SATA III internal SSD using QLC flash.
• Sequential speeds up to 560/530 MB/s, the practical limit of SATA.
• Samsung quotes improved random and sustained performance over the 860 QVO.
• Limited warranty of up to three years or a set TBW, whichever comes first.
• Works with Magician software; best for upgrading SATA-based desktops and laptops.

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