id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
3867	[filesystem] filesystem::exists() improperly throws on windows when path specifies an empty CD/DVD drive	David Grigsby	Beman Dawes	"If you call filesystem::exists() with a path pointing to an empty cd/dvd drive on windows, a filesystem exception will be thrown due to status_template returning fs::status_unknown.

Boost 1.41.0 returns fs::file_not_found for ""USB card reader with no card inserted"" (operations.cpp, line 195).

The comment is ""these are not considered errors; the status is considered not found"".

I believe an empty cd/dvd drive should be treated analogously to an empty USB card reader, that is, no exception should be thrown.

The exception is occurring because the error code returned by windows (ERROR_NOT_READY) is not in the list of codes that are specifically checked.

I am attaching a patch.

Thanks!"	Bugs	closed	Boost 1.42.0	filesystem	Boost 1.41.0	Problem	fixed