Adding an extra hard drive to your laptop is an easy way to increase your storage capacity without purchasing a new device. However, the installation process raises questions even among experienced users: how to choose a compatible drive, where to physically place it in a compact case, and what to do if the laptop does not have a second slot for HDD or SSD?

In this article we will analyze all the stages - from diagnosing the capabilities of your laptop to setting up BIOS and formatting a new disk. We will pay special attention to the nuances: for example, why M.2 SATA And M.2 NVMe are not interchangeable, how to avoid conflicts with AHCI/RAID-modes, and what to do if the system does not see the new disk. You will also find a compatibility table for popular laptop models and storage types.

1. Compatibility check: which drive is suitable for your laptop

Before you buy additional storage, you need to understand what types of drives your laptop supports. Here are the key parameters − physical form factor And connection interface.

Most modern laptops support:

  • 📏 2.5" SATA III — classic HDD/SSD with a thickness of 7 or 9.5 mm. Suitable for replacing the main drive or installing instead of a DVD drive (via caddy adapter).
  • 🔌 M.2 - compact SSD with keys B, M or B+M. Important: M.2 SATA And M.2 NVMe Externally identical, but not interchangeable!
  • 💾 mSATA - outdated format, found in laptops before 2015 (for example, Lenovo ThinkPad T440 or Dell Latitude E7440).

To find out what slots your laptop has:

  1. Download the utility HWiNFO or CrystalDiskInfo - they will show the current disks and free ports.
  2. Look at the model specifications on the manufacturer’s website (section Storage or Expansion).
  3. Disassemble the laptop (carefully!) and inspect the motherboard for loose connectors.
📊 What type of drive are you planning to install?
  • 2.5" SATA SSD/HDD
  • M.2 SATA
  • M.2 NVMe
  • I don't know, I need to decide
⚠️ Attention: Laptops Apple MacBook (until 2015) and some ultrabooks (for example, Dell XPS 13 or HP Spectre) have sealed drives. Install a second disk in them physically impossible without modification of the case.

2. Selecting a drive: HDD vs SSD, capacity and brands

If your laptop supports several types of disks, the choice depends on the tasks:

Criterion HDD (2.5" SATA) SSD (2.5" SATA) SSD (M.2 NVMe)
Price for 1 TB ~3 000 ₽ ~6 000 ₽ ~7 500 ₽
Reading speed 80–120 MB/s 500–550 MB/s 2,000–7,000 MB/s
Capacity up to 5 TB up to 4 TB up to 2 TB
Reliability Shock sensitive Vibration resistant The most reliable
For what tasks File storage, backups System, programs Games, video processing

Recommended brands:

  • 💿 HDD: Seagate Barracuda, WD Blue, Toshiba X300 (for laptops, choose low-power models, e.g. WD Blue Mobile).
  • 🚀 SATA SSD: Samsung 870 EVO, Crucial MX500, Kingston KC600.
  • ⚡ NVMe SSD: Samsung 980 Pro, WD Black SN850X, Corsair MP600 (Please note support PCIe 3.0/4.0 your motherboard!).
💡

If you choose between Samsung 980 And 980 Pro, please note: the first model uses PCIe 3.0 and cheaper, and the second - PCIe 4.0 (but requires support from the laptop).

3. Preparing the laptop: tools and disassembly

To install the second disk you will need:

  • ⚒️ Screwdriver PH00 or PH0 (for most laptops).
  • 🧲 Antistatic bracelet (or ground yourself by touching the radiator).
  • 📦 Plastic spatula for snapping off latches (if the case is on clips).
  • 🔋 External battery (if you plan to test the drive without the main battery).

Disassembly order:

☑️ Preparing to install the disk

Done: 0 / 5

Where to look for the slot for the second disk:

  • 🔍 B 2.5" bay - if there is free space next to the main disk (for example, in Lenovo Legion or ASUS ROG).
  • 🔍Under DVD drive - will be required caddy adapter (costs ~500 ₽).
  • 🔍 On motherboard - look for the connector M.2 (usually next to the Wi-Fi module).
⚠️ Attention: In laptops Acer Aspire and some HP Pavilion slot M.2 may be occupied by a module Wi-Fi or 4G. Before buying a disk, check if the connector is free!

4. Installing a disk: step-by-step instructions for different types

The installation process depends on the drive type and slot. Let's look at the three most common scenarios.

Scenario 1: Installing a 2.5" HDD/SSD in a free slot

If the laptop has a free compartment for 2.5" drive (for example, in Dell Inspiron 15 or MSI GF63):

  1. Insert the disk into the slot so that the connectors SATA And nutrition coincided with the nests.
  2. Secure the disk with screws (usually 4 pieces in the corners).
  3. Connect the cables if they were disconnected.

Scenario 2: Replacing DVD drive with HDD/SSD

Will be required caddy adapter (For example, ORICO 2.5" to 9.5mm):

  1. Remove the DVD drive by releasing the latch or unscrewing the screw.
  2. Place the disk into the adapter and secure it.
  3. Insert the structure into the slot instead of the drive (the latch should click).
What if the laptop does not see the disk after installing it in the caddy?

Check if your model supports hot-swappable DVD drive. In some cases (for example, HP ProBook) you need to enable the option SATA ODD Port in BIOS.

Scenario 3: Installing an M.2 SSD

For M.2 disks:

  1. Locate the slot on the motherboard (usually at an angle of 30-45°).
  2. Insert the disc at an angle, then press and secure with a screw.
  3. Make sure the contacts are not bent (especially on drives with double-sided chips, e.g. Crucial P5 Plus).
💡

If after installation M.2 NVMe the laptop does not turn on or the disk is not detected, check the length of the disk: some laptops only support the format 2242 or 2280 (numbers indicate size in mm).

5. BIOS setup: enabling a new drive

After physical installation you need to configure BIOS/UEFIso that the system sees the new disk. Go to the BIOS (usually the F2, Del or Esc on boot) and follow the steps:

  1. Check if the drive appears in the partition Main or Storage.
  2. If there is no disk:
    • 🔧 Make sure that SATA Mode installed in AHCI (not RAID or IDE).
    • 🔧 For M.2 NVMe enable the option NVMe Support or PCIe Storage.
    • 🔧 Update the BIOS if the disk is not detected (relevant for older laptops, for example, Lenovo G500).
  • Save the settings (F10) and reboot.

    • If the drive is visible in the BIOS but not in Windows, continue to the next section.

    6. Formatting and initializing a disk in Windows

    The new drive must be initialized and formatted before it can be used. This can be done through the built-in Windows tools:

    1. Click Win + X → Disk management.
    2. Find a new drive (it will be marked as Not distributed).
    3. Right click → Initialize disk → select GPT (for disks >2 TB) or MBR.
    4. Create a new volume:
      • 📁 Specify the drive letter (for example, D:).
      • 🔠 Select file system: NTFS (for HDD/SSD) or exFAT (if the disk will be used on Mac/Linux).
      • ✅ Click Done.

    For Linux use the command:

    sudo fdisk -l  # найти новый диск (например, /dev/sdb)

    sudo mkfs.ext4 /dev/sdb1  # отформатировать в ext4
    

    sudo mount /dev/sdb1 /mnt/mydisk  # примонтировать

    ⚠️ Attention: If you are installing a disc instead of a DVD drive via caddy adapter, Windows can assign it a letter already occupied by the virtual drive. In this case, change the letter to Disk Management.

    7. Optimizing the operation of the second disk

    To make the new disk work efficiently:

    • 🔄 For HDD: disable indexing (disk properties → uncheck Allow indexing).
    • ⚡ For SSD: turn on TRIM (command in CMD: fsutil behavior set disabledeletenotify 0).
    • 📊 Use CrystalDiskMark to check the speed - if the performance is lower than expected, check the connection (for example, M.2 SATA instead of NVMe can give speeds of only 500 MB/s).

    For gaming laptops (eg. ASUS TUF or MSI Katana) it is useful to transfer the library Steam or Epic Games to the second disk:

    1. In the launcher settings, add a new folder for games.
    2. Transfer existing games via Properties -> Local Files -> Move.

    FAQ: Frequently asked questions about installing a second disk

    Is it possible to install a second drive if the laptop only has one slot?

    Yes, there are three options:

    1. Replace DVD drive with caddy adapter with HDD/SSD.
    2. Use external box for disk (connects via USB 3.0, but the speed will be lower).
    3. Replace the main disk with a high-capacity one SSD (For example, Samsung 870 QVO 2 TB).
    The laptop does not see the M.2 SSD - what to do?

    The problem may be:

    • 🔌 Key incompatibilities: for example, a disk with a key B+M will not fit into the slot only for M.
    • 🔧 Disabled port in BIOS (look for options M.2 Slot Enable or PCIe Storage).
    • 🛠️ Problems with firmware: Update the BIOS on the manufacturer's website.
    How to transfer the system to a new SSD without reinstalling Windows?

    Use cloning programs:

    1. Macrium Reflect Free - free version with support GPT-disks.
    2. Clonezilla — for experienced users (works with Linux).
    3. Samsung Data Migration - if you have an SSD from Samsung.

    Important: after cloning, disconnect the old disk to avoid bootloader conflicts!

    Is it possible to use the second disk as a cache for the main one (Intel Optane technology)?

    Technology Intel Optane Memory allows you to speed up your HDD with a small M.2-module (for example, Intel Optane 32 GB). However:

    • ✅ Works only with processors Intel (7th generation and newer).
    • ✅ Requires motherboard support (check specifications).
    • ❌ Not compatible with AMD and the majority NVMe SSD.
    Which drive to choose for storing games: HDD or SSD?

    Depends on budget and requirements:

    • 🎮 HDD: Cheaper, but games will take longer to load (e.g. GTA V — ~2 minutes versus 30 seconds on SSD).
    • 🚀 SATA SSD: optimal balance of price and speed (suitable for Cyberpunk 2077, Call of Duty).
    • ⚡ NVMe SSD: maximum speed, but it makes sense to overpay only for DirectStorage-games (for example, Forspoken).