IBM (2003)。Information about 4690 OS unique file distribution attributes, IBM document R1001487, 2003-07-30。(存档副本. [2014-05-20]. (原始内容存档于2014-05-21).): "[...] file types are stored in "Reserved bits" portion of PC-DOS file directory structure [...] only 4690 respects和preserves these attributes。Various non-4690操作系统 take different actions if these bits are turned on [...] when copying from一个diskette created on一个4690系统。[...] PC-DOS和Windows 2000 Professional will copy file without error和zero bits。OS/2 [...] 1.2 [...] will refuse to copy file unless [...] first run CHKDSK /F on file。After [...] CHKDSK, it will copy file和zero bits。[...] when [...] copy [...] back to 4690 system, [...] file will copy as一个local file."
IBM (2003)。Information about 4690 OS unique file distribution attributes, IBM document R1001487, 2003-07-30。(存档副本. [2014-05-20]. (原始内容存档于2014-05-21).): "[...] file types are stored in "Reserved bits" portion of PC-DOS file directory structure [...] only 4690 respects和preserves these attributes。Various non-4690操作系统 take different actions if these bits are turned on [...] when copying from一个diskette created on一个4690系统。[...] PC-DOS和Windows 2000 Professional will copy file without error和zero bits。OS/2 [...] 1.2 [...] will refuse to copy file unless [...] first run CHKDSK /F on file。After [...] CHKDSK, it will copy file和zero bits。[...] when [...] copy [...] back to 4690 system, [...] file will copy as一个local file."