Additional SSD for a laptop: how to increase memory without losing speed

Do you feel like your laptop is suffocating due to lack of space? Photos, projects, games and systems take up every gigabyte, and replacing the main drive seems like a radical step? There is a solution: additional SSD (solid state drive) is a way to expand memory without sacrificing performance. But how to choose the right model, not make a mistake with the interface and not waste money?

In this article we will look at all the nuances: from the differences between M.2 SATA, NVMe And 2.5" SATA SSD to step-by-step installation and configuration of the RAID array. You will find out what laptops do not support additional drives due to BIOS limitations (spoiler: these are many models Apple MacBook and ultrabooks Dell XPS), how to transfer the system to a new drive without reinstalling Windows, and why a cheap SSD may be worse than no upgrade at all.

It doesn't matter if you need a disk for file storage, speed up loading or working with heavy programs - After reading, you will be able to make an informed decision. And if you doubt your abilities, at the end of the article there is FAQ with answers to the most difficult questions.

1. Why do you need an additional SSD in a laptop: 5 real reasons

Many users mistakenly believe that a second SSD is needed only for “boosting” gaming laptops. Actually the reasons are much broader:

• 📁 Lack of space on the main disk. Even 512 GB quickly runs out if you work with videos, 3D models or store project archives. An additional SSD solves the problem without deleting old files.
• ⚡ Load Sharing. System and programs at a glance NVMe, and the files are on a capacious SATA SSD. This way the laptop doesn’t slow down when copying large files.
• 🔄 Backup. The second disk can be used for automatic backups (for example, via Macrium Reflect or Time Machine).
• 🎮 Games and virtual machines. Modern games take up 100+ GB, and virtual machines (for example, for software testing) require separate disk space.
• 💰 Savings. Replacing the main drive with a larger one is often more expensive than buying an additional SSD + adapter.

But there is also pitfalls. For example, in some laptops the second slot M.2 only works in mode SATA, not PCIe, which negates the benefits NVMe. Or the BIOS may not support booting from the secondary drive. More on this in the next section.

2. Compatibility: How to check if your laptop supports a second SSD

Before you buy a drive, you need to answer three questions:

1. Does the laptop have physical slot for the second disk?
2. Which interface supported (SATA, PCIe x2, PCIe x4)?
3. Can BIOS load from an additional drive?

You can check this in several ways:

• 🔍 Visual inspection. Open the back cover of the laptop (if it is removable) and look for a free connector. Most often this is:
• Slot M.2 2280 (the most common, 80 mm long).
• Slot M.2 2242 (short, 42 mm - found in compact laptops).
• Connector for 2.5" SATA SSD (found in older or budget models).
• 🖥️ Diagnostic programs. Utilities like HWiNFO, CrystalDiskInfo or AIDA64 will show the current disks and free slots.
• 📄 Official documentation. On the manufacturer's website (for example, Lenovo, HP, Asus) search Hardware Maintenance Manual for your model.

Pay special attention slot operation protocol. For example, in laptops Lenovo ThinkPad T480 second M.2 only supports SATA, and in Dell XPS 15 - full-fledged PCIe 3.0 x4. If you install NVMe into slot SATA, it will run at speed SATA III (up to 550 MB/s), not 3000+ MB/s.

How to check the supported protocol in HWiNFO?

Open the program → Go to the section Motherboard → Find the item M.2 Slots. In the column Supported Protocols will indicate which standards are available (e.g. PCIe x4, SATA).

Laptop manufacturer	Model	Second slot type	Max. speed	Download support
Lenovo	ThinkPad T14 (Gen 2)	M.2 2280 (PCIe 4.0 x4)	7000 MB/s	Yes
HP	Pavilion 15	M.2 2280 (SATA)	550 MB/s	No
Asus	ROG Zephyrus G14	M.2 2280 (PCIe 3.0 x4)	3500 MB/s	Yes
Acer	Swift 3	2.5" SATA	550 MB/s	Yes

⚠️ Attention: In laptops Apple MacBook Pro/Air (2016–2020) additional SSDs are not supported due to the proprietary connector. In models with chip M1/M2 Upgrading the drive is physically impossible - the memory is soldered to the motherboard.

3. Which SSD to choose: SATA, NVMe or external?

The market offers three main types of SSDs for laptops. Each has its pros and cons:

3.1. M.2 SATA SSD

Pros:

• ✅ Cheaper NVMe by 20–30% at the same volume.
• ✅ Compatible with almost all laptops (even old ones).
• ✅ Low power consumption (important for autonomy).

Cons:

• ❌ Read/write speed is limited to 550 MB/s (like hard drives HDD).
• ❌ Not suitable for heavy tasks (video editing, games with fast loading).

For whom: Users who need additional volume for file storage, not speed.

3.2. M.2 NVMe SSD

Pros:

• ✅ Speed up to 7000 MB/s (10-12 times faster SATA).
• ✅ Ideal for system disk, games, working with large files.
• ✅ Supports modern protocols (PCIe 4.0/5.0).

Cons:

• ❌ More expensive SATA SSD by 30–50%.
• ❌ May overheat in compact laptops (requires a heatsink).
• ❌ Not all laptops support full speed (for example, PCIe 3.0 x2 instead of x4).

For whom: Those who want maximum performance and is willing to pay for speed.

3.3. External SSD (USB-C/Thunderbolt)

Pros:

• ✅ Does not require disassembling the laptop.
• ✅ Can be connected to other devices (PC, tablet, TV).
• ✅ Speed up to 2000 MB/s (when using Thunderbolt 3/4).

Cons:

• ❌ Depends on the port (USB 3.0 is limited to 500 MB/s).
• ❌ Risk of loss or damage (unlike built-in disk).

For whom: Owners of laptops without free slots (for example, MacBook or Ultrabook).

4. TOP 5 SSDs for laptops in 2026 (price/quality ratio)

We analyzed the market and selected the best models for different tasks. All drives are tested for compatibility with popular laptops (Lenovo ThinkPad, Dell XPS, HP Spectre, Asus ROG).

Model	Type	Volume	Speed (read/write)	Price for 1 TB	Best use
Samsung 980 Pro	NVMe PCIe 4.0	1 TB	7000 / 5000 MB/s	~12 000 ₽	Games, video editing, system disk
Crucial P5 Plus	NVMe PCIe 4.0	1 TB	6600 / 5000 MB/s	~10 500 ₽	Budget alternative Samsung
WD Blue SA510	M.2 SATA	1 TB	560 / 530 MB/s	~7 000 ₽	File storage, backups
Kingston KC3000	NVMe PCIe 4.0	1 TB	7000 / 6000 MB/s	~11 000 ₽	Professional tasks (3D, programming)
Samsung T7 Shield	External (USB 3.2)	1 TB	1050 / 1000 MB/s	~9 500 ₽	Mobility, work with multiple devices

When choosing, pay attention to write resource (TBW). For example, at Samsung 980 Pro it is 600 TB per 1 TB of volume, and for budget models it is only 200–300 TB. This is important if you plan to frequently rewrite data (for example, edit video).

⚠️ Attention: Some laptops (eg. Lenovo Yoga or HP Envy) have a “white list” of supported SSDs in the BIOS. If you install a disk not from this list, it may not be detected. Check the forums before purchasing (e.g. NotebookReview or Reddit).

5. Step-by-step instructions: how to install an additional SSD in a laptop

Installing an SSD is a simple process, but requires care. You will need:

• ✅ Screwdriver (usually Phillips #0 or T5).
• ✅ Plastic spatula (for separating latches).
• ✅ Antistatic bracelet (optional, but recommended).
• ✅ Thermal pad (if installing NVMe without radiator).

Unplug the laptop and remove the battery (if removable)

Back up your data (to an external drive or to the cloud)

Prepare your work area (clean surface, good lighting)

Download drivers for the new SSD (from the manufacturer’s website) -->

Step 1. Disassemble the laptop

1. Turn the laptop over and remove all the screws on the back cover. In some models (for example, MacBook) you will need a special screwdriver Pentalobe.
2. Carefully pry off the lid with a plastic spatula. Start at the corner where there are no latches (usually marked with an arrow or text PUSH).
3. Remove the cover and find the SSD slot. It can be covered with a metal plate or thermal pad.

Step 2. Install SSD

1. If slot M.2, insert the disc at an angle of 30° and press lightly until it is secured with the screw.
2. If slot 2.5", use an adapter (if needed) and secure the drive with screws.
3. For NVMe with a radiator, apply thermal paste to the controller chip (if provided by the design).

Step 3. Assembly and configuration

1. Replace the cover and tighten the screws (do not overtighten!).
2. Turn on the laptop and go to the BIOS (usually the F2, Del or Esc when loading).
3. Check if a new disk is detected in the partition Storage or Boot.
4. If the drive is not visible, update the BIOS to the latest version.

After installing the SSD you need initialize it on Windows:

1. Click Win + X → Disk management.
2. Find the new drive (it will be marked as "Unallocated").
3. Right click → Create a simple volume → follow the instructions.

6. Optimization: How to configure a second SSD for maximum performance

Simply transferring files to a new drive will not increase speed. To unlock the potential of your SSD, follow these steps:

6.1. Transferring the system to a new SSD (if it is faster than the main one)

If you have installed NVMe into a slot with support PCIe 4.0, and the main disk is slow SATA SSD, it makes sense to migrate the system. To do this:

1. Download a cloning program (for example, Macrium Reflect, Clonezilla or Samsung Data Migration).
2. Connect the new SSD via an adapter USB → M.2 (if it is not already installed on the laptop).
3. Start cloning (select option Sector-by-sector copy for an exact copy).
4. Once complete, disconnect the old drive and boot from the new one.

Important: After cloning, check the bootloader. If Windows does not start, use the utility bootrec on the command line:

bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd

6.2. Setting up a RAID array (for advanced users)

If there are two identical ones in the laptop NVMe, you can combine them into RAID-0 to double the speed or RAID-1 for mirroring (backup). However:

• ⚠️ RAID-0 increases speed, but if one disk fails, data is lost.
• ⚠️ RAID-1 reliable, but the useful volume is halved.
• ⚠️ Not all laptops support hardware RAID (you need to check in the BIOS).

To configure RAID on Windows:

1. Click Win + R → enter mdsched.exe → reboot.
2. On the menu Disk management select drives → Create Volume → RAID.
3. Select array type and confirm.

6.3. Optimization for games and heavy programs

If you are using a second SSD for gaming or video work, make these settings:

• 🎮 For games: B Steam or Epic Games specify the installation path to the new disk (Settings → Downloads → Library folders).
• 🎬 For video editing: B Adobe Premiere or DaVinci Resolve configure cache on fast NVMe (Edit → Preferences → Media Cache).
• 🖥️ For virtual machines: B VirtualBox or VMware create a virtual disk on the second SSD.

7. Common mistakes and how to avoid them

Even experienced users sometimes make mistakes when installing an additional SSD. Here are the most common:

• 🔌 Incompatible connector. For example, trying to install NVMe into slot SATA (or vice versa). Always check the slot markings:
  • Key B - only SATA.
  • Key M - only PCIe.
  • Key B+M — universal (suitable for both types).
• 🔥 NVMe overheating. Many laptops do not have cooling for a second SSD. If the drive heats up above 70°C, use a thermal pad or heat sink.
• 🖥️ BIOS does not see the disk. Reasons:
  • Outdated BIOS version (needs to be updated).
  • The disk is not initialized in Disk Management.
  • The mode is disabled in the BIOS AHCI (needs to be enabled).
• 💾 SSD performance is slow. If the speed is lower than stated, check:
  • Is the drive connected to the correct slot (for example, PCIe 3.0 x4, not x2).
  • Is the mode enabled in the BIOS PCIe Gen 4 (if supported).
  • Is the disk more than 80% full (this reduces speed).

⚠️ Attention: Some laptops (eg. Asus ROG Strix) second slot M.2 disabled when connecting an external video card via Thunderbolt. Check it out in the documentation!

FAQ: Answers to popular questions

Is it possible to install two SSDs in a laptop if there is only one slot?

Yes, but you will need to replace the main drive with a larger one or use an external SSD. Alternative - adapter M.2 → 2.5", if the laptop has a connector for SATA SSD.

Which SSD is better for gaming: NVMe or SATA?

For modern games (Cyberpunk 2077, Star Citizen) definitely NVMe — it reduces loading time and reduces stuttering when streaming textures. However, for older games (CS:GO, Dota 2) there will be no difference.

Do I need to format my new SSD before use?

Yes, but not in FAT32, and in NTFS (for Windows) or APFS (for macOS). Formatting is performed automatically when the disk is initialized in Disk Management.

Is it possible to use an SSD from a laptop in a PC?

Yes, if the interfaces match. For example, M.2 NVMe from a laptop suitable for PCIe slots on the PC motherboard (adapter required). Pay attention to the length of the disk (2280, 2260, 2242).

Why did my laptop start to discharge faster after installing the SSD?

It's normal for NVMe - they consume more energy than SATA SSD. To reduce costs, turn off indexing and minimize background programs. Also check to see if the drive is getting hot (high temperatures increase consumption).