Hot swapping is the replacement or addition of components to a computer system without stopping, shutting down, or rebooting the system. Hot plugging describes only the addition of components to a run
Hot-swapping a hard drive in a storage server
Sun SPARCstation hot swappable Single Connector Attachment (SCA) drive cradle[citation needed]
PCI Express, officially abbreviated as PCIe, is a high-speed standard used to connect hardware components inside computers. It is designed to replace older expansion bus standards such as PCI, PCI-X a
Hot swapping
…However, it is common for mid to high-end servers and mainframes to feature hot-swappable capability for hardware components, such as CPU, memory, PCIe, SATA and SAS drives. Most smartphones and tablets with tray-loading holders can interchange SIM cards without powering down the system…
A PCIe 3.0 x8 host bus adapter
Various slots on a computer motherboard, from top to bottom: PCI Express x4 PCI Express x16 PCI Express x1 PCI Express x16 Conventional PCI (32-bit, 5 V)
PCI Express x1 card containing a PCI Express switch (covered by a small heat sink), which creates multiple endpoints out of one endpoint and lets multiple devices share it
The PCIe slots on a motherboard are often labeled with the number of PCIe lanes they have. Sometimes what may seem like a large slot may only have a few lanes. For instance, a x16 slot with only 4 PCIe lanes (bottom slot) is quite common.