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lyallp
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Joined: 15 Jul 2004
Posts: 1616
Location: Adelaide/Australia
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 Posted: Thu Jul 26, 2007 10:43 am Post subject: FYI: Mounting USB drives at known points |
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Given that if you plug in a usb drive, depending on how you have things setup, your device mounts at /media/blah or is assigned device /dev/sda
Now, unplug that drive, put in another and it will get the same mounts/devices.
Plug the second one in, it ends up with a different device, different mount point.
This always annoyed me.
I discovered, by digging around /dev/ and /proc that the directory /dev/disk/by-id is amazingly useful for identifying removable drives
This led to me creating the following fstab entries.
| Code: |
# Memory cards (flash card) and USB Disks
/dev/disk/by-id/usb-DataFab_Systems_Inc._USB_to_CF.SM_Combo_7797D71897-part1 /mnt/usb/dataFab vfat noauto,sync,user,gid=usbd,umask=0,umask=007,quiet 0 0
/dev/disk/by-id/usb-Transcend_USB_2.0_Reader_363603001E7D-part1 /mnt/usb/transcend vfat noauto,sync,user,gid=usbd,umask=0,umask=007,quiet 0 0
/dev/disk/by-id/usb-WDC_WD20_00JB-00GVA0_DEF1082AC0DB-part1 /mnt/usb/externalCase vfat noauto,user,gid=usbd,umask=0,umask=007,quiet 0 0
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So, now, it doesn't matter what I plug in, in what order, the devices always appears in the expected place, for that device.
I am wondering if this is the most effective means but it seems to work fine for me 
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...Lyall |
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swimmer
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Joined: 15 Jul 2002
Posts: 1330
Location: Netherlands
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| Posted: Thu Jul 26, 2007 11:44 am Post subject: |
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In case you are using udev (which is default nowadays on Gentoo systems) you could solve that with a few additional udev-rules. But you still need the fstab entries of course ...
Here's how I did it: | Code: |
/etc/udev/rules.d/10-local.rules
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BUS=="usb", SYSFS{manufacturer}=="LaCie", KERNEL=="sd?", NAME="lacie"
BUS=="usb", SYSFS{manufacturer}=="LaCie", KERNEL=="sd?[0-9]", NAME="lacie%n"
BUS=="usb", SYSFS{manufacturer}=="iRiver", KERNEL=="sd?", NAME="iriver", OWNER="swimmer"
BUS=="usb", SYSFS{manufacturer}=="iRiver", KERNEL=="sd?[0-9]", NAME="iriver%n", OWNER="swimmer"
ATTRS{media}=="cdrom", KERNEL=="hdc", SYMLINK+="cdrom", OWNER="swimmer" |
| Code: |
/etc/fstab
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# Lacie
/dev/lacie1 /media/lacie auto auto,user 0 0
# Iriver H340
/dev/iriver1 /media/iriver auto auto,user,flush,iocharset=utf8,uid=1000,umask=007 0 0
# DVD
/dev/hdc /media/dvd auto auto,user 0 0
# Cdrom
/dev/cdrom /media/cdrom auto auto,user 0 0
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Greetz
swimmer |
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lyallp
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Joined: 15 Jul 2004
Posts: 1616
Location: Adelaide/Australia
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| Posted: Tue Jul 31, 2007 11:21 am Post subject: |
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Actually, with a touch more investigation, I have managed to get my USB keys to mount as I expect.
I previously showed how I setup my /etc/fstab to take advantage of udev symlinks in /dev/disk/by-id
| Code: |
# Memory cards (flash card) and USB Disks
/dev/disk/by-id/usb-DataFab_Systems_Inc._USB_to_CF.SM_Combo_7797D71897-part1 /mnt/usb/dataFab vfat noauto,user,gid=usbd,umask=0,umask=007,quiet 0 0
/dev/disk/by-id/usb-Transcend_USB_2.0_Reader_363603001E7D-part1 /mnt/usb/transcend vfat noauto,user,gid=usbd,umask=0,umask=007,quiet 0 0
/dev/disk/by-id/usb-WDC_WD20_00JB-00GVA0_DEF1082AC0DB-part1 /mnt/usb/externalCase vfat noauto,user,gid=usbd,umask=0,umask=007,quiet 0 0
/dev/disk/by-id/usb-USB_Flash_Drive_123456789ABCDEF /mnt/usb/KanesUSB vfat noauto,user,gid=usbd,umask=0,umask=007,quiet 0 0
/dev/disk/by-id/usb-USB_Flash_Disk_90740C0025A6-part1 /mnt/usb/LyallsUSB vfat noauto,user,gid=usbd,umask=0,umask=007,quiet 0 0
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I have my local /etc/udev/rules.d/98-local.rules (rather than 10-local.rules, or in addition to), which I modified to contain...
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BUS=="usb", SYSFS{serial}=="DEF1082AC0DB", ACTION=="add", RUN+="/bin/mount /mnt/usb/externalCase"
BUS=="usb", SYSFS{serial}=="363603001E7D", ACTION=="add", RUN+="/bin/mount /mnt/usb/transcend"
BUS=="usb", SYSFS{model}=="PNY/Datafab CF+S", ACTION=="add", RUN+="/bin/mount /mnt/usb/dataFab"
BUS=="usb", SYSFS{serial}=="90740C0025A6", ACTION=="add", RUN+="/bin/mount /mnt/usb/LyallsUSB"
BUS=="usb", SYSFS{serial}=="123456789ABCDEF", ACTION=="add", RUN+="/bin/mount /mnt/usb/KanesUSB"
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The reason for the 98 prefix rather than 10 is that the symlinks in /dev/disk/by-id are not created until rule 60-persistent-storage.rules, so I had to move my rules to execute after them.
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