Editing Laptop (section)

===Expansion cards===
As of 2025, very few laptops support expansion cards, with the primary means of expansion being via USB-C or Thunderbolt.

In the past, a [[PC Card]] (formerly [[PCMCIA]]) or [[ExpressCard]] slot for expansion was often present on laptops to allow adding and removing functionality, even when the laptop is powered on; these are becoming increasingly rare since the introduction of [[USB 3.0]]. Some internal subsystems such as Ethernet, Wi-Fi, or a wireless cellular modem can be implemented as replaceable internal expansion cards, usually accessible under an access cover on the bottom of the laptop. The standard for such cards is [[PCI Express]], which comes in both [[PCI Express Mini Card|mini]] and even smaller [[M.2]] sizes. In newer laptops, it is not uncommon to also see [[Micro SATA#mSATA|Micro SATA]] (mSATA) functionality on PCI Express Mini or M.2 card slots allowing the use of those slots for SATA-based solid-state drives.<ref name="parts-cards">{{cite web|title=Innovations in Notebook Expansion |url=http://www.hardwaresecrets.com/article/89 |archive-url=https://web.archive.org/web/20050428031253/http://www.hardwaresecrets.com/article/89 |archive-date=28 April 2005 |author=Gabriel Torres |date=25 November 2004 |publisher=Hardware Secrets, LLC |access-date=15 November 2008 }}</ref>

[[Mobile PCI Express Module]] (MXM) is a type of expansion card that is used for graphics cards.<ref>{{Cite web |title=Notebook Video Card Upgrade / Replacement |url=https://www.notebookcheck.net/Upgrade-Replace-a-Notebook-Video-Card.3236.0.html |website=NotebookCheck}}</ref>