Analysis of information sources in references of the Wikipedia article "File Allocation Table" in English language version.
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... only 2^12 (that is, 4096) allocation units or clusters can be addressed. In fact, the number is less than this, since 000h and 001h are not used and FF0h to FFFh are reserved or used for other purposes, leaving 002h to FEFh (2 to 4079) as the range of possible clusters.
CP/M 4.1 (DOS Plus [1.2]) allows the use of two file systems - CP/M and DOS. The version [...] supplied with the Amstrad PC1512 cannot handle larger floppies than 360k (CP/M) / 1.2Mb (DOS), or larger hard drive partitions than 32Mb. [...] The DOS file system can be either FAT12 or FAT16. The format is exactly as in PCDOS 2.11, except: Byte 0Ch of the directory entry [...] holds the four "user attributes" F1'-F4' [...] DRDOS-style passwords are not supported.
{{cite web}}: CS1 maint: date and year (link)file types are stored in the "Reserved bits" portion of the PC-DOS file directory structure [...] only 4690 respects and preserves these attributes. Various non-4690 operating systems take different actions if these bits are turned on [...] when copying from a diskette created on a 4690 system. [...] PC-DOS and Windows 2000 Professional will copy the file without error and zero the bits. OS/2 [...] 1.2 [...] will refuse to copy the file unless [...] first run CHKDSK /F on the file. After [...] CHKDSK, it will copy the file and zero the bits. [...] when [...] copy [...] back to the 4690 system, [...] file will copy as a local file.
ACCDATE=drive1+|- [drive2+|-]..."Clusters cannot be 64 kilobytes or larger
This byte [...] is not modified while running Windows 95 and neighter by SCANDISK or DEFRAG. [...] If another program sets the value to 0x00 for a file that has EAs these EAs will no longer be found using DosFindFirst/Next calls only. The other OS/2 calls for retrieving EAs (DosQueryPathInfo, DosQueryFileInfo and DosEnumAttribute) do not rely on this byte. Also the opposite could [...] occur. [...] In this situation only the performance of directory scans will be decreased. Both situations [...] are corrected by CHKDSK.
{{cite web}}: CS1 maint: bot: original URL status unknown (link)The numbering starts with 2; the first two numbers, 0 and 1, are reserved.
{{cite web}}: CS1 maint: date and year (link)The numbering starts with 2; the first two numbers, 0 and 1, are reserved.
Clusters cannot be 64 kilobytes or larger
This byte [...] is not modified while running Windows 95 and neighter by SCANDISK or DEFRAG. [...] If another program sets the value to 0x00 for a file that has EAs these EAs will no longer be found using DosFindFirst/Next calls only. The other OS/2 calls for retrieving EAs (DosQueryPathInfo, DosQueryFileInfo and DosEnumAttribute) do not rely on this byte. Also the opposite could [...] occur. [...] In this situation only the performance of directory scans will be decreased. Both situations [...] are corrected by CHKDSK.
{{cite web}}: CS1 maint: bot: original URL status unknown (link)CP/M 4.1 (DOS Plus [1.2]) allows the use of two file systems - CP/M and DOS. The version [...] supplied with the Amstrad PC1512 cannot handle larger floppies than 360k (CP/M) / 1.2Mb (DOS), or larger hard drive partitions than 32Mb. [...] The DOS file system can be either FAT12 or FAT16. The format is exactly as in PCDOS 2.11, except: Byte 0Ch of the directory entry [...] holds the four "user attributes" F1'-F4' [...] DRDOS-style passwords are not supported.
file types are stored in the "Reserved bits" portion of the PC-DOS file directory structure [...] only 4690 respects and preserves these attributes. Various non-4690 operating systems take different actions if these bits are turned on [...] when copying from a diskette created on a 4690 system. [...] PC-DOS and Windows 2000 Professional will copy the file without error and zero the bits. OS/2 [...] 1.2 [...] will refuse to copy the file unless [...] first run CHKDSK /F on the file. After [...] CHKDSK, it will copy the file and zero the bits. [...] when [...] copy [...] back to the 4690 system, [...] file will copy as a local file.