SD Card slot
PCI-based SD Card slot
This implementation is called "SD Card with IO support", and supports in addition to regular SD memory cards also special SDIO cards (e.g. Bluetooth, WiFi, etc).
lspci reports it as a Ricoh device with PCI ID 1180:0822 (X Series, Z60t), or 1180:0841 (Z Series).
Models featuring this Technology
USB based SD Card slot
This implementation only supports SD Memory cards.
Should be supported by the Linux USB Storage drivers (usb-storage).