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+What: /sys/devices/.../removable
+Date: May 2021
+Contact: Rajat Jain <rajatxjain@gmail.com>
+Description:
+ Information about whether a given device can be removed from the
+ platform by the user. This is determined by its subsystem in a
+ bus / platform-specific way. This attribute is only present for
+ devices that can support determining such information:
+
+ =========== ===================================================
+ "removable" device can be removed from the platform by the user
+ "fixed" device is fixed to the platform / cannot be removed
+ by the user.
+ "unknown" The information is unavailable / cannot be deduced.
+ =========== ===================================================
+
+ Currently this is only supported by USB (which infers the
+ information from a combination of hub descriptor bits and
+ platform-specific data such as ACPI) and PCI (which gets this
+ from ACPI / device tree).