Does your computer take forever to boot? Are your files slow to open? Nine times out of ten, the culprit is an old mechanical hard drive. Replacing that drive with an SSD is the upgrade that changes the most for the least money.
You still need to pick the right one. NVMe, SATA, M.2, 2.5 inch… the vocabulary is intimidating, but the logic is simple. This guide explains it all.
If you already have an SSD and your PC is still slow, the problem lies elsewhere. I can run a free diagnostic at the workshop to identify the real cause.
Hard drive vs SSD: the fundamental difference
A classic hard drive (HDD) contains spinning magnetic platters. A read head physically moves to read data. It's slow, it vibrates, it heats up, and it eventually fails.
An SSD (Solid State Drive) has no moving parts. Data is stored on electronic chips, like a USB stick but much faster and more reliable. The result: boot in 10–15 seconds instead of 2 minutes, applications that open instantly.
| Hard drive (HDD) | SSD | |
|---|---|---|
| Read speed | ~100 MB/s | 500–7000 MB/s |
| Boot time | 60–120 s | 10–20 s |
| Noise | Yes (clicking) | None |
| Shock resistance | Low | Good |
| Lifespan | 3–5 years | 5–10 years |
| Price (1 TB) | ~50€ | 90–160€ |
The two interfaces: SATA vs NVMe
This is the most important distinction to understand.
SATA
SATA is the historic interface for hard drives. SATA SSDs come in two physical formats:
- 2.5 inch (like a small portable hard drive), connects with a cable in towers and some laptops
- M.2 SATA : small stick format, plugs directly into the motherboard
Maximum speed: ~550 MB/s. More than enough for office work, web, photos.
NVMe
NVMe uses the PCIe bus, which is much faster. Format: M.2 only. Speeds range from 1,500 MB/s (entry-level) to 7,000 MB/s (high-end PCIe 4.0).
The difference is felt mostly with large file transfers (4K video, creative software) and load times for recent games.
For office work and web, a SATA SSD is plenty. The everyday difference between SATA and NVMe is imperceptible if you open Word, Chrome and a few photos. NVMe really pays off for intensive uses: video editing, PC gaming, virtualisation.
How to check what your PC supports
Before buying, check two things:
1. The available physical format
Open your PC or laptop and look for:
- An M.2 slot on the motherboard (small rectangular slot, ~22 × 80 mm) → you can fit an M.2 NVMe or M.2 SATA
- A 2.5 inch bay with a SATA cable → SATA 2.5" SSD only
- Some laptops only have one or the other
If you're not sure, search your exact model on Google + "SSD upgrade" or bring it into the workshop.
2. NVMe or SATA on the M.2 slot?
Not all M.2 slots support NVMe. Older PCs (before about 2016) often only have M.2 SATA. Check your motherboard or laptop spec sheet.
Putting an NVMe SSD into an M.2 SATA-only slot, it physically fits but won't work. Always check compatibility before buying.
What capacity to choose?
| Use | Recommended capacity |
|---|---|
| Secondary PC, light office | 256 GB |
| Main PC (office, web, photos) | 500 GB – 1 TB |
| Creative, PC gaming, multimedia storage | 1 TB – 2 TB |
| Workstation, 4K video | 2 TB+ |
My advice: get at least 500 GB : a 256 GB will fill up very quickly with Windows + software. SSD prices have crept back up since late 2024 (flash memory shortages): budget between 60 and 200€ depending on capacity at the time of purchase.
Reliable brands in 2025
Not all brands are equal. Here are the manufacturers I rely on regularly at the workshop:
Excellent value for money:
- Crucial (P3, P3 Plus, MX500), reliable, 5-year warranty, good support
- Samsung (870 EVO, 990 Pro), the absolute benchmark, more expensive but unbeatable for durability
- WD (Blue, Black, Green), solid, good NVMe range
Acceptable, check carefully:
- Kingston, Seagate, fine but check the exact model
Avoid:
- Unknown brands under €25 for 1 TB on Amazon. Recycled flash components have very short lifespans.
How an SSD upgrade goes
Whether you call a technician or you're a DIY type, here's how SSD replacement plays out at the workshop:
- 1Pick the right SSD, check compatibility (format, NVMe/SATA interface) with your exact model. If in doubt, bring the PC in: I check for free before any purchase.
- 2Back up your data, before any work, a full backup to an external drive or cloud is mandatory. I never start without this step.
- 3Open the PC and remove the old drive, depending on the model, this takes 5 to 20 minutes. On a laptop you often need to remove the battery first. On a tower it's much simpler.
- 4Install the new SSD, the SSD plugs into the M.2 slot or screws into the 2.5 inch bay. No soldering, no special tools beyond an appropriate screwdriver.
- 5Migrate data or reinstall Windows, two options: cloning the existing drive (Windows + data + software transferred identically) or a clean Windows reinstall (recommended if the system is old or unstable). At the workshop, migration is included in the service.
- 6Check and test, first boot, confirm Windows recognises the SSD, run a speed test and validate everything works before returning the PC.
SSD budget by capacity
A note: after years of falling prices, SSDs have crept back up since late 2024 due to reduced NAND flash production. Here are the real ranges I see at the workshop in 2026 (excluding labour):
The laptop case: precautions to take
On a laptop, replacing an SSD often means opening the machine. It's usually doable but a few models have the SSD soldered to the motherboard (especially some MacBooks, Surface, recent ultrabooks). In that case, no upgrade is possible.
Check before investing. If you're not comfortable opening the device, I do it for 20€ labour at the workshop, migrating existing content to the new SSD without data loss is included.
Want to upgrade your SSD? I'll advise the right model and fit it at the workshop.
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What to remember
- SATA: universal, fast enough for everyday use, cheaper
- NVMe: much faster, ideal for intensive use
- 500 GB minimum recommended today
- Reliable brands: Crucial, Samsung, WD
- Always check compatibility before buying
A well-chosen SSD can turn an ageing PC into a snappy machine. It's often the first thing I recommend before considering a full replacement.
Frequently asked questions