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32 .Nd introduction to devices and device drivers
34 This section contains information related to devices, device drivers
41 .Em pseudo-devices
53 The set of system calls available for devices is chosen from
72 .Ss Accessing Devices
73 Most of the devices in
91 For pseudo-devices, device nodes may be created and removed dynamically
106 of devices visible within different instances of the
109 subsystems from accessing unsafe devices.
113 Drivers for network devices do not use device nodes in order to be
145 access devices.
149 devices for disk and tape drives existed in two variants, known as
153 devices, or to use better terms, buffered and unbuffered
155 devices.
162 Raw devices were traditionally named with a prefix of
169 all disk devices are now
175 devices no longer exist at all.
177 Buffered devices were accessed through a buffer cache maintained by
183 Buffered devices could be read or written at any
186 In contrast, raw disk devices can be read or