A lot of Dell devices default to “RAID” over *AHCI* for the storage configuration in the system firmware. In this case, the device is not detected. A driver is needed for that added in commit 34a956db3774e8cba3f6b52aa9c1d67cf9a496fe (Add support driver for Intel Rapid Start Technology) in 2013. > Intel Rapid Start Technology is a firmware-based suspend-to-disk > implementation. Once placed in S3, the device will wake once either a > timeout elapses or the battery reaches a critical level. It will then resume > to the firmware and copy the contents of RAM to a specialised partition, and > then power off the machine. If the user turns the machine back on the > firmware will copy the contents of the partition back to RAM and then resume > from S3 as normal. > > This driver provides an interface for configuring the wakeup events and > timeout. It still requires firmware support and an appropriate suspend > partition. PS: It might make sense to switch to *AHCI* nevertheless due to faster performance. But the Internet says to test yourself.