EdwardKing wrote:
Thanks your answer!

I use dmesg | tail
#dmesg | tail

sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 2194304266 Hz quality 800
Timecounters tick every 1.000 msec
hptrr: no controller detected.
ad0: 5120MB <VMware Virtual IDE Hard Drive 00000001> at ata0-master UDMA33
acd0: CDROM <VMware Virtual IDE CDROM Drive/00000001> at ata1-master UDMA33
Waiting 5 seconds for SCSI devices to settle
GEOM_LABEL: Label for provider acd0 is iso9660/FreeBSD_Install.
Trying to mount root from ufs:/dev/ad0s1a

If you issued the command right after you plugged the USB stick in your system, it has not been detected. The last line

#mount_msdosfs ufs:/dev/ad0s1a  /mnt
mount_msdosfs ufs:/dev/ad0s1a: : Operation not permitted

Because there is no file ufs:/dev/ad0s1a, note that ufs: is not part of the path of the device in the file system.

#mount_msdosfs /dev/ad0s1a  /mnt
mount_msdosfs /dev/ad0s1a: : Operation not permitted

Because the /dev/ad0s1a device is already mounted as the root file system.

#device umass
device: not found

The shell says there is no command `device'.

It seems you would take advantage from reading section «18. Storage» in the Handbook, especially section 18.2 that explains thow to recognize devices after their names, and section 18.5 that is devoted to USB devices. Again, the URL for section 18 is:


(Note that top-posting obfuscates the dialog history, so it is best to avoid top-posting.)

----- Original Message ----- From: "Michaël Grünewald" <[EMAIL PROTECTED]>
To: "EdwardKing" <[EMAIL PROTECTED]>
Sent: Wednesday, August 13, 2008 1:46 PM
Subject: Re: How to visit U disk?

EdwardKing wrote:
I want to use U disk which format is FAT32,I don't know how to visit
U disk,my dev directory is follows: #cd /dev #ls ... usb usb0 usb1 ...

How to do it? Thanks in advance
After you plug the stick in the system, it is attached by the kernel
which issues some information. This information is visible in the
console, you can also access it with the dmesg utility:

  $ dmesg | tail
umass0: <Sony Storage Media, class 0/0, rev 2.00/1.00, addr 2> on uhub4
  da0 at umass-sim0 bus 0 target 0 lun 0
  da0: <Sony Storage Media 0100> Removable Direct Access SCSI-0 device
  da0: 40.000MB/s transfers
  da0: 247MB (506880 512 byte sectors: 64H 32S/T 247C)
  GEOM_LABEL: Label for provider da0s1 is msdosfs/USBSTICK.

You can see above example output from my system.
The stick is available here through `/dev/da0s1' or through

Not that some environements will automagically mount the stick for you,
usually at some directory under /var/media.

You may also want to read parts of the `Storage section' in the Handbook:


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