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-.TH USBDISK 4
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-.SH NAME
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-usbdisk, usbfat: - serve USB mass storage devices
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-.SH SYNOPSIS
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-.B usb/disk
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-[
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-.B -dDfl
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-] [
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-.B -m
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-.I mountpoint
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-] [
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-.B -s
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-.I srvname
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-] [
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-.I ctrlno
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-.I id
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-]
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-.LP
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-.B usbfat:
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-[
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-.B -fl
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-] [
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-.I disk
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-[
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-.I mntpt
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-] ]
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-.SH DESCRIPTION
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-.I Disk
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-serves a directory named
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-.I mountpoint
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-(default
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-.BR /n/disk )
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-containing the files
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-.B ctl
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-and
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-.IR n ,
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-where
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-.I n
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-is the number of a LUN to access,
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-for all detected LUNs of the named or found USB device.
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-.I Disk
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-searches for a USB device with class 8 (storage),
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-subclass 2 (ATAPI CD/DVD/BD),
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-5 (removable, ATAPI-like) or
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-6 (SCSI transparent),
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-and
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-protocol 0x50 (bulk), or uses
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-.BI /dev/usb/ ctrlno / id
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-if specified.
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-In every LUN directory are the files
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-.B data
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-and
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-.BR raw .
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-.B data
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-gives read/write access to blocks of the device.
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-.B raw
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-is a raw SCSI-like interface (talk to it with
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-.IR scuzz (8)).
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-.PP
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-The root directory's
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-.B ctl
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-file accepts the command
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-.LR reset ,
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-which tells
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-.I disk
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-to again fetch the information about all LUNs,
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-and yields the device geometries when read.
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-.PP
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-The
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-.B -d
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-option generates debugging output.
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-The
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-.B -f
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-option avoids freaking out some cheap USB flash disks by not issuing
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-UMS reset commands to them.
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-The
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-.B -l
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-option asks the device for its maximum LUN.
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-By default,
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-.I disk
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-assumes a maximum LUN of zero, since some devices
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-get upset if you ask them for their maximum LUN.
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-Flash memory devices are likely to have multiple LUNs.
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-The
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-.B -m
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-option mounts the served hierarchy on
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-.I mountpoint
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-instead of
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-.BR /n/disk .
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-The
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-.B -s
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-option posts a mountable file descriptor as
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-.BI /srv/ srvname.
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-The
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-.B -D
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-option prints all 9P messages.
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-.SH EXAMPLES
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-Access the usual preformatted FAT partition:
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-.IP
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-.EX
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-% usb/usbd
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-% usb/disk -l
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-% disk/fdisk -p /n/disk/0/data
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-part dos 7 31559
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-% dossrv -f /n/disk/0/data:7 usbstorage
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-dossrv: serving #s/usbstorage
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-% mount /srv/usbstorage /n/d:
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-% ls -l /n/d:
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-alrw-rw-rw- M 39 bill trog 180364 Oct 5 18:14 /n/d:/9LOAD
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-d-rwxrwxrwx M 39 bill trog 0 Nov 13 14:30 /n/d:/benedict
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-.EE
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-.LP
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-The latter part of the above example, from
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-.B disk/fdisk
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-to
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-.BR mount ,
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-has been packaged up as
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-.IR usbfat: ,
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-which mounts the FAT file system in the DOS partition of the named
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-.I disk
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-(by default
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-.BR /n/disk/0/data )
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-on
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-.I mntpt
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-(by default
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-.BR /n/usb ).
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-.SH FILES
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-.TF /srv/usbsfs.ctlr.id
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-.TP
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-.B /n/disk
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-default mountpoint
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-.TP
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-.B /n/usb
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-default mountpoint for FAT file system on the disk
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-.TP
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-.B /srv/usbfat.$user
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-FAT file system service
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-.SH SOURCE
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-.B /sys/src/cmd/usb/disk
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-.br
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-.B /rc/bin/usbfat:
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-.SH SEE ALSO
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-.IR fs (3),
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-.IR sd (3),
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-.IR usb (3),
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-.IR partfs (8),
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-.IR prep (8),
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-.IR scuzz (8)
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-.SH BUGS
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-Should implement
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-.IR sd (3)'s
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-interface for each LUN.
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-Currently,
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-if there are multiple partitions, you can use
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-.IR fs (3)
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-to manage them.
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-If
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-.L "fdisk -p"
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-prints nothing,
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-there is no partition table on the device,
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-so one can invoke
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-.IR dossrv (4)
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-directly.
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-.PP
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-USB 1 flash disks' I/O rates are slow and variable.
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-Reading and writing in large units (e.g., 4KB) seems to be faster
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-by an order of magnitude when transferring large volumes of data.
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David du Colombier