If the maximum thickness for an M.2 SSD in your Lenovo ThinkPad P1 Gen2 is 2.22mm, then you will need to purchase an SSD that fits within this specification. Here are some advantages and disadvantages of two options you could consider:

1. Buying a smaller M.2 SSD:

Advantages:
- Smaller M.2 SSDs are generally less expensive than larger ones, so you could save money by purchasing a smaller drive.
- M.2 SSDs are faster and more reliable than traditional hard drives, so you'll benefit from improved system performance.
- With a smaller SSD, you'll have more room in your laptop for other components, such as additional memory or a larger battery.

Disadvantages:
- Depending on your storage needs, a smaller M.2 SSD may not provide enough storage space. You'll need to make sure that you have enough space to store all of your files and applications.
- If you need more storage in the future, you may need to upgrade to a larger SSD or purchase an external hard drive.

2. Buying an external SSD:

Advantages:
- External SSDs are portable and easy to use. You can easily connect them to your laptop via USB or Thunderbolt and access your files from anywhere.
- With an external SSD, you can choose the storage capacity that best suits your needs, so you'll have more flexibility in terms of storage space.
- If you need to transfer large files between devices, an external SSD can be a faster and more convenient option than using cloud storage.

Disadvantages:

- External SSDs are generally more expensive than internal SSDs, so you may end up spending more money than you would with an internal drive.
- If you need to access your files quickly, an external SSD may not be as fast as an internal SSD since it needs to communicate with your laptop via a USB or Thunderbolt connection.

Ultimately, the decision between buying a smaller M.2 SSD or an external SSD will depend on your individual needs and budget. If you need a lot of storage space and don't mind spending more money, an external SSD may be a better option. However, if you want to save money and have a faster, more reliable drive, a smaller M.2 SSD may be the way to go.
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