I was just re-installing Windows 7 x64 on a Dell Latitude e6220. After installing drivers, there was one "Unknown Device" in device manager. In Properties -> Details, the Hardware Id is listed as:
ACPI\SMO8800
SMO8800
Turns out this is a driver for the hard drive's free fall sensor. Go to dell support, select computer type and your operating system. Select the "Application" category and you will see:
ST Microelectronics-Driver
Applies to: Free Fall Sensor
Direct Link (Win7 x64): http://www.dell.com/support/drivers/us/en/19/DriverDetails/DriverFileFormats?DriverId=F91KT&FileId=2731102934
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