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diff --git a/manpages/mkfs.exfat.8 b/manpages/mkfs.exfat.8 new file mode 100644 index 0000000..76a0065 --- /dev/null +++ b/manpages/mkfs.exfat.8 @@ -0,0 +1,131 @@ +.TH mkfs.exfat 8 +.SH NAME +mkfs.exfat \- create an exFAT filesystem +.SH SYNOPSIS +.B mkfs.exfat +[ +.B \-b +.I boundary_alignment +] [ +.B \-c +.I cluster_size +] [ +.B \-f +] [ +.B \-h +] [ +.B \-L +.I volume_label +] [ +.B \-U +.I volume_guid +] [ +.B \-\-pack\-bitmap +] [ +.B \-v +] +.I device +.br +.B mkfs.exfat \-V +.SH DESCRIPTION +.B mkfs.exfat +creates an exFAT filesystem by writing on a special +file using the values found in the arguments of the command line. +It is invoked automatically by +.BR mkfs (8) +when it is given the +.B \-t exfat +option. +.PP +As an example, to make a filesystem on the first partition on the first +SCSI disk, use: +.IP +.B mkfs.exfat /dev/sda1 +.PP +.SH OPTIONS +.TP +.BR \-b ", " \-\-boundary\-align =\fIalignment\fR +Specifies the alignment for the FAT and the start of the cluster heap. +The \fIalignment\fR argument is specified in bytes or may be specified with +\fBm\fR/\fBM\fR suffix for mebibytes or \fBk\fR/\fBK\fR suffix for kibibytes +and should be a power of two. +Some media like SD cards need this for optimal performance and endurance, +in which case \fIalignment\fR should be set to half of the card's native +boundary unit size. +If the card's native boundary unit size is not known, refer to the following +table of boundary unit sizes recommended by the SD Card Association. +.\" source: SD Specifications Part 2: File System Specification Version 3.00 +.TS +center; +cb1s6cbcb,nnnn. +Card Capacity Range Cluster Size Boundary Unit +_ + \[<=]8 MiB 8 KiB 8 KiB +>8 MiB \[<=]64 MiB 16 KiB 16 KiB +>64 MiB \[<=]256 MiB 16 KiB 32 KiB +>256 MiB \[<=]1 GiB 16 KiB 64 KiB +>1 GiB \[<=]2 GiB 32 KiB 64 KiB +>2 GiB \[<=]32 GiB 32 KiB 4 MiB +>32 GiB \[<=]128 GiB 128 KiB 16 MiB +>128 GiB \[<=]512 GiB 256 KiB 32 MiB +>512 GiB \[<=]2 TiB 512 KiB 64 MiB +.TE +The default is always 1 MiB. +.TP +.BR \-c ", " \-\-cluster\-size =\fIsize\fR +Specifies the cluster size of the exFAT file system. +The \fIsize\fR argument is specified in bytes or may be specified with +\fBm\fR/\fBM\fR suffix for mebibytes or \fBk\fR/\fBK\fR suffix for kibibytes +and must be a power of two. +The default value is described in the following table: +.TS +center; +cb1s6cb,nnn. +Card Capacity Range Cluster Size +_ + \[<=]256 MiB 4 KiB +>256 MiB \[<=]32 GiB 32 KiB +>32 GiB 128 KiB +.TE +.TP +.BR \-f ", " \-\-full\-format +Performs a full format. +This zeros the entire disk device while creating the exFAT filesystem. +.TP +.BR \-h ", " \-\-help +Prints the help and exit. +.TP +.BR \-L ", " \-\-volume\-label =\fIlabel\fR +Specifies the volume label to be associated with the exFAT filesystem. +.TP +.BR \-U ", " \-\-volume\-guid =\fIguid\fR +Specifies the volume GUID to be associated with the exFAT filesystem. +.TP +.B \-\-pack\-bitmap +Attempts to relocate the exFAT allocation bitmap so that it ends at the +alignment boundary immediately following the FAT rather than beginning at that +boundary. +This strictly violates the SD card specification but may improve performance +and endurance on SD cards and other flash media not designed for use with exFAT +by allowing file-system metadata updates to touch fewer flash allocation units. +Furthermore, many SD cards and other flash devices specially optimize the +allocation unit where the FAT resides so as to support tiny writes with reduced +write amplification but expect only larger writes in subsequent allocation +units \[em] where the exFAT bitmap would be placed by default. +Specifying \fB\-\-pack\-bitmap\fR attempts to avoid the potential problems +associated with issuing many small writes to the bitmap by making it share an +allocation unit with the FAT. +If there is insufficient space for the bitmap there, then this option will have +no effect, and the bitmap will be aligned at the boundary as by default. +.TP +.BR \-q ", " \-\-quiet +Prints only error messages while creating the exFAT filesystem. +.TP +.BR \-v ", " \-\-verbose +Prints verbose debugging information while creating the exFAT filesystem. +.TP +.BR \-V ", " \-\-version +Prints the version number and exits. +.SH SEE ALSO +.BR mkfs (8), +.BR mount (8), |