You want to increase your storage capacity, but you don't know if your laptop supports installing a second one. SSD? This problem is familiar to many: manufacturers often do not indicate the presence of a free slot in the specifications, and disassembling the device without preparation is fraught with loss of warranty. In this article we will look at 7 reliable ways to check compatibility, including model analysis, visual inspection and software tools - without the risk of damaging equipment.

We will pay special attention to the nuances: for example, why in some laptops Dell Latitude or Acer Swift slot M.2 may be occupied by the Wi-Fi module, and in Lenovo ThinkPad - reserved for WWAN (mobile internet). You will also learn how to distinguish SATA-slot from NVMe and what to do if there is physically a place, but the BIOS does not see it.

1. Checking the laptop model: where to look for technical specifications

The first and safest way is to study the official documentation. Manufacturers often hide information about free slots in general specifications, but it may be in service manuals or on the support pages.

Where to look:

  • 🔍 Official website of the brand: Enter the full model name (for example, HP Pavilion 15-eg0004ur) into the search engine with the addition of the phrase “service manual" or "hardware maintenance manual».
  • 📄 Documentation for the motherboard: if the laptop is based Intel or AMD, check the chipset specifications (eg HM570 or B550).
  • 🛒 Seller pages: on DNS, Sitronics or Amazon In the “Questions and Answers” section, users often share their upgrade experiences.

Example: at the model ASUS ROG Zephyrus G14 (GA401) The manual states that there is a second slot M.2 2280 under NVMe, but it may be occupied by the drive on some modifications. And in MacBook Pro 13" (2020) There is only one slot - despite marketing promises of “easy upgrade”.

⚠️ Attention: If the specifications indicate "1x M.2", this does not always mean there is no second slot. Sometimes manufacturers do not mention the slot reserved for Optane Memory (y Intel) or 4G/5G module.
📊 What brand is your laptop?
  • ASUS
  • Lenovo
  • HP
  • Dell
  • Acer
  • Apple
  • MSI
  • Other

2. Visual inspection: how to find a slot for a second SSD without disassembling

Don't want to disassemble your laptop? There are ways to assess the availability of a free slot without opening the case:

Method 1: Inspect the bottom cover. Many manufacturers put a diagram of the location of components on it. Look for the inscriptions:

  • 🔧 «M.2 SSD" or "NGFF"(obsolete name M.2).
  • 📶 «WLAN"- if the slot is occupied by a Wi-Fi module, it can sometimes be replaced with SSD adapter (but it's risky!).
  • 🚫 «No serviceable parts inside" - y Apple or Microsoft Surface this means that an upgrade is not possible.

Method 2: Checking the RAM compartment. In some models (for example, Lenovo Legion 5) slot M.2 located next to the connector SO-DIMM for RAM. If the lid is removable, lift it and look inside (without removing it completely!).

What to do if there is no diagram on the cover?

If there is no diagram, take a photo of the insides through the gap (for example, using a smartphone in macro mode) and compare with photos of similar models on the forums NotebookCheck or Reddit.

Method 3: Case thickness analysis. Laptops are thinner 18 mm rarely have two slots M.2 (exception - Razer Blade or MSI GS66 with ultra-compact boards). In budget models (for example, Acer Aspire 5) the second slot is often physically absent.

3. Software methods: how to check SSD slot via Windows, Linux or BIOS

If you don't want to disassemble your laptop, use diagnostic utilities. They will show how many slots M.2/SATA available on the motherboard, even if they are empty.

For Windows:

  • 🖥️ HWiNFO (free version): open the " tabMotherboard» → «PCI Express" Look for devices marked "Non-Volatile memory controller"(this NVMe) or "SATA Controller».
  • 🔍 CrystalDiskInfo: will show only connected drives, but in the "PCIe» a free slot may appear.
  • 🛠️ Device Manager: go to "Device Manager» → «Storage controllers" If there is an unidentified device with an exclamation mark, it may be an empty slot.

For Linux:

lspci | grep -i "non-volatile memory"

This command will list NVMe-controllers. If there is more than one, but there is only one disk in the system, the second slot is free.

Via BIOS/UEFI:

Restart your laptop, click F2/Del/Esc (depending on the model) and find the section:

  • «Advanced» → «SATA Configuration"(for SATA SSD).
  • «PCIe/PCI» → «M.2 Configuration"(for NVMe).
⚠️ Attention: Some laptops (eg. HP EliteBook) slot M.2 may be disabled by default in the BIOS. If you don't see it in the utilities, check your settings "M.2 Slot Enable/Disable».

1. Download HWiNFO from the official website|https://www.hwinfo.com/

2. Run in “Summary-only” mode

3. Go to the “Motherboard” tab

4. Check the “PCI Express” section for free links (for example, “x4” for NVMe)

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4. Motherboard analysis: how to determine the slot type (SATA, NVMe, PCIe)

Even if there is a slot, it may not fit your SSD. Let's look at the types of connectors:

Slot type Physical connector Max. speed Compatible SSDs Example of laptops
SATA M.2 (B-key) Left cutout (6 pins) 600 MB/s SATA SSD (For example, Crucial MX500) Lenovo IdeaPad 330, Acer Aspire E15
NVMe PCIe x2 (M-key) Right cutout (5 pins) 2000 MB/s NVMe (For example, WD Black SN750) ASUS TUF Gaming A15, MSI GF63
NVMe PCIe x4 (M-key) Right cutout (5 pins) 3500–7000 MB/s NVMe Gen3/Gen4 (For example, Samsung 980 Pro) Dell XPS 15, HP Omen 16
SATA 2.5" Classic connector 600 MB/s 2.5" SATA SSD (For example, Kingston A400) Lenovo ThinkPad T480 (there is a bay for a second HDD)

How to determine slot type visually:

  1. If the board has a connector with 7+15 contacts and the cutout on the right is M-key for NVMe.
  2. If the cutout is on the left and contacts 6+20 - this is B-key for SATA or NGFF (obsolete standard).
  3. If a slot is marked as "WWAN" - it is intended for a mobile modem, but sometimes supports SSD via adapter (for example, in Dell Latitude 7490).

Important: In laptops with Intel Optane (For example, HP Spectre x360) the second slot can be occupied by a cache module. It can be removed, but this will disable the technology Optane Memory.

💡

If your laptop has a slot M.2 with support PCIe x2, don't buy expensive NVMe Gen4 — its speed will be limited to ~2000 MB/s. Optimal choice: WD Blue SN550 or Crucial P2.

5. Compatibility check using user database

Manufacturers do not always update documentation, and actual compatibility may vary. In such cases they help enthusiast databases:

  • 🌍 NotebookCheck (notebookcheck.net): enter your laptop model and add “SSD upgrade" For example, for Lenovo Yoga 7i users will confirm that there is a second slot, but it only works with PCIe 3.0.
  • 💬 Reddit (r/laptops or r/thinkpad): look for topics that mention your model and the words “dual SSD».
  • 📊 UserBenchmark (userbenchmark.com): test results are published here, indicating the storage configuration.

Case study: in ASUS Vivobook S14 (S433) 1 slot officially listed M.2, but users found a second one under the RAM compartment. And in MacBook Air M1 Upgrade is not possible - SSD is soldered to the board.

How to search:

  1. Type into Google: "[laptop model] + "second SSD" site:reddit.com».
  2. Check the date of the post - current information is no older than 2-3 years.
  3. Pay attention to photographs of disassembled laptops (for example, iFixit).
⚠️ Attention: If reviews mention that after installing a second SSD, the laptop “does not see” it, this may mean:
  • — BIOS update required (for example, in Lenovo Legion Y540 up to version EKCN33WW).
  • - You need to turn on the mode AHCI in the BIOS (relevant for older models with Intel RST).
  • — The slot only supports SATA, and you installed NVMe (or vice versa).

6. Physical inspection: how to safely disassemble a laptop and inspect the slot

If all previous methods have failed, all that remains is partial disassembly. Follow the instructions to avoid damaging the device:

Step 1. Preparation.

  • 🔌 Turn off the laptop and disconnect the charger.
  • 🔋 Remove the battery (if it is removable).
  • 📸 Take a photo of the location of the screws - they may vary in length!

Step 2: Removing the bottom cover.

  • Use a plastic spatula (or pick) to pry off the lid, starting at the corner.
  • The screws may be hidden under the legs - carefully peel them off.

Step 3. Search for a slot.

Slot M.2 It looks like a narrow connector with a screw lock. Please note:

  • 🔧 If the slot is empty, but there is a small screw nearby, this is an SSD mount.
  • 📡 If a module is installed in the slot Wi-Fi (usually with antennas), it can be replaced with SSD adapter, but this is risky (the network may be disrupted).
  • 🚫 If the slot is covered with a metal cover with the warning “Warranty Void» - disassembly will void the warranty.
💡

If you find a free slot M.2, but are not sure of its type, look at the marking next to the connector. For example, "PCIe x4" or "SATA/PCIe" will indicate the supported protocols.

Step 4: Check compatibility.

If there is a slot, but you don’t know which one SSD suitable:

  1. Look at the motherboard markings (eg LA-B341P for ASUS).
  2. Enter it into a search engine with the addition of “SSD compatibility».
  3. If there is no information, select an SSD with key M+B (universal, for example, Kingston KC600).

7. Alternative options: what to do if there is no second slot

If your laptop does not support the second SSD, there are workarounds:

  • 💾 Replacing the Primary Drive: if you have HDD, replace it with SSD larger volume (for example, Samsung 870 EVO 2TB).
  • 🔌 External SSD: connect via USB 3.2 Gen2 or Thunderbolt (speed up to 1000–2000 MB/s). Optimal models: Samsung T7 Shield or SanDisk Extreme Pro.
  • 🔄 Optane Memory: if you have Intel-laptop with support Optane, you can install a caching module (for example, Intel Optane 32GB), but the performance gain will be minimal.
  • ☁️ Cloud storage: for files that do not need quick access, suitable Google Drive or Yandex Disk (but this will not replace a local SSD).

Features of external SSDs:

  • 🔥 Thunderbolt 3/4 provides speeds up to 2800 MB/s (for example, OWC Envoy Pro FX).
  • ⚡ USB 3.2 Gen2 (10 Gbps) gives ~1000 MB/s - this is enough for games and video editing.
  • ⚠️ Avoid cheap adapters M.2 → USB - they often limit the speed to 500 MB/s.

Example: in MacBook Pro 13" (2017) there is no second slot, but through Thunderbolt 3 you can connect an external one NVMe-storage (for example, Sabrent Rocket XTRM-Q) at a speed of 2500 MB/s.

💡

If you are choosing an external SSD for gaming, pay attention to models with USB 3.2 Gen2x2 (20 Gbit/s), for example, Seagate FireCuda Gaming SSD. They provide speeds of up to 2000 MB/s, which is enough for most games without lag.

FAQ: Frequently asked questions about a second SSD in a laptop

❓ Is it possible to install a second SSD if the laptop already has M.2 NVMe?

Yes, if the motherboard has a second physical slot. For example, in Lenovo ThinkPad P53 there are two of them: one for the system disk, the second is free. But in MacBook Air M1/M2 Upgrade is not possible due to soldered storage.

Check:

  1. Laptop model in the database NotebookCheck.
  2. Availability of a free slot through HWiNFO.
  3. Physical inspection (if warranty is not valid).
❓ What to do if the BIOS does not see the second SSD?

Causes and solutions:

  • 🔧 Slot disabled in BIOS: go to settings and enable the option "M.2 Slot Enable" or "NVMe Support».
  • 🔄 Incompatible protocol: if slot SATA, and you installed NVMe (or vice versa), the disk will not be detected.
  • 🖥️ Outdated BIOS firmware: Update it from the manufacturer's official website.
  • 🛠️ Problems with initialization: On Windows, open "Disk management" and check whether the partition needs to be created.
❓ Which SSD to choose for the second slot: SATA or NVMe?

Depends on slot type:

  • If slot SATA M.2: take it Crucial MX500 or Samsung 870 EVO (speed up to 560 MB/s).
  • If slot NVMe PCIe 3.0 x4: optimal WD Black SN750 or SK hynix Gold P31 (3500 MB/s).
  • If slot PCIe 4.0 x4: Samsung 980 Pro or Seagate FireCuda 530 (7000 MB/s), but make sure your laptop supports Gen4 (For example, ASUS ROG Strix G15 with Ryzen 5000).

⚠️ Don't buy NVMe for SATA-slot - it won't work!

❓ Is it possible to replace a DVD drive with a second SSD?

Yes, but with reservations:

  • 💿 In laptops with a compartment for DVD-RW (For example, Dell Inspiron 15 5000) can be installed 2.5" SATA SSD through skid adapter (costs ~500 rub.).
  • ⚡ Speed will be limited SATA III (600 MB/s).
  • ❌ In ultrabooks (for example, HP Spectre x360) There is no DVD drive, so this method will not work.

Adapter example: ORICO 2.5" SATA HDD/SSD Caddy.

❓ Does a second SSD affect laptop performance?

Depends on configuration:

  • ⚡ Pros:
    • Increase storage capacity without replacing the main drive.
    • Ability to distribute the system and games/files across different disks (reduces fragmentation).
  • ⚠️ Cons:
    • Additional NVMe can increase heating (relevant for thin laptops).
    • In some models (for example, MSI GS65) the second slot works on PCIe x2, which limits the speed.

For games: second NVMe will speed up loading levels if the main disk is busy (for example, in Cyberpunk 2077 or Star Citizen).