winger9
04-01-2013, 02:23 PM
Hi
Could you fine chaps help me please.
Got Knoppix distro 7.0.2, kernel release 3.3.7, on hard disk, on Acer Aspire
5755G laptop.
1. Here's a SUMMARY of what I'd like to find out thanks:
a) I did a umount of a USB memory stick, which caused a crash. I think I need to
create a new /etc/fstab because the one I've got, now has a remnant entry in it
which I don't think should be there, and is causing a problem. My present
/etc/fstab is:
# DEFAULT BASE FSTAB, UNCONFIGURED
proc /proc proc noauto 0 0
sysfs /sys sysfs noauto 0 0
/dev/sda6 / reiserfs relatime 0 0
/dev/sda5 none swap defaults 0 0
# Added by KNOPPIX
noauto,users,exec 0 0
# Added by KNOPPIX
/dev/sdb1 /media/sdb1 vfat
noauto,users,exec,umask=000,shortname=winnt,uid=kn oppix,gid=knoppix 0 0
# Added by KNOPPIX
/dev/sr0 /media/sr0 auto noauto,users,exec 0 0
# Added by KNOPPIX
/dev/sda2 /media/sda2 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppi x 0
0
# Added by KNOPPIX
/dev/sda1 /media/sda1 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppi x 0
0
# Added by KNOPPIX
/dev/sda3 /media/sda3 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppi x 0
0
b) The lines which I don't think should be there are:
# Added by KNOPPIX
noauto,users,exec 0 0
# Added by KNOPPIX
/dev/sdb1 /media/sdb1 vfat
noauto,users,exec,umask=000,shortname=winnt,uid=kn oppix,gid=knoppix 0 0
c) SO (*** MAIN QUESTIONS ***):
(i) AM I RIGHT ABOUT "b)"?
(ii) DO I JUST NEED TO RE-CREATE /etc/fstab, AND IF SO HOW DO I DO THAT?
(iii) BUT I THINK /etc/fstab IS GETTING THE INFO FOR LINE "/dev/sdb1 /media/sdb1
vfat ..." FROM A FILE SOMEWHERE ON THE SYSTEM, BECAUSE THERE IS *NO* MEMORY
STICK PRESENTLY IN ANY USB SLOT SINCE BOOT-UP (WHICH IS WHAT WOULD NORMALLY
CAUSE THAT LINE TO BE THERE I BELIEVE). IF IT *IS* GETTING THE INFO FROM A
FILE, HOW DO I FIX THAT PLEASE?
(iv) I THINK THIS WHOLE ISSUE MAY HAVE CAUSED 15 NEW ENTRIES TO APPEAR IN /dev,
IE /dev/sdb1 to sdb15. WHY IS THIS? AND DOES IT MATTER? (See 6.)
----------------------------------------------------------------------------
Full Details:
2. a) I recently wiped (intentionally) the entire contents of a USB memory stick
using the following method:
b) Plugged 2Gb memory stick into a USB slot. I let the system detect and mount
it. "mount" returned the following info:
/dev/sdb1 on /media/sdb1 type reiserfs (rw,nosuid,nodev,relatime)
c) In a terminal I ran
dd if=/dev/zero of=/dev/sdb1
This writes all zeros to the entire memory stick.
d) I unmounted the stick with I believe
umount /dev/sdb1
But this caused the entire system to hang. Not even CTRL+ALT+BACKSPACE or
CTRL+ALT+DEL could make it respond. I realised that there was NO filesystem
anymore on the stick to be actually unmounted.
3. When I rebooted, in pcmanfm filemanager, at the left was a device icon
labelled "sdb1", but there was NO memory stick plugged in any USB socket.
"mount" gave the following info (which doesn't show "sdb1"):
/dev/root on / type reiserfs (rw,relatime)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
usbfs on /proc/bus/usb type usbfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,relatime,size=2097152k)
udev on /dev type tmpfs (rw,relatime,size=20480k)
tmpfs on /dev/shm type tmpfs (rw,relatime,size=2097152k)
devpts on /dev/pts type devpts (rw,relatime,mode=1777)
4. Then I looked in /etc/fstab, which is shown at 1.a). I don't think the lines
that I've shown at 1.b) should be in /etc/fstab. In particular, it looks as
though it is the entry "/dev/sdb1 /media/sdb1 vfat ..." that is causing pcmanfm
to think that such a device is present. But there is no memory stick (or
anything else) plugged into any USB slot.
5. So the umount that I did at 2.d) (and the crash) seems to have caused this
situation.
6. Also, I've noticed that in /dev there are 15 files (block devices) called
/dev/sdb1 to sdb15. I seem to think that they weren't there before. In fact
there seem to be a lot of other entries in /dev that I don't recall being there
before, such as /dev/sdg1 to sdg15. Does this matter, and is it linked to the
umount crash?
7. I would be everso grateful if you could suggest possible answers to my
questions at 1.c).
Many thanks. John
Could you fine chaps help me please.
Got Knoppix distro 7.0.2, kernel release 3.3.7, on hard disk, on Acer Aspire
5755G laptop.
1. Here's a SUMMARY of what I'd like to find out thanks:
a) I did a umount of a USB memory stick, which caused a crash. I think I need to
create a new /etc/fstab because the one I've got, now has a remnant entry in it
which I don't think should be there, and is causing a problem. My present
/etc/fstab is:
# DEFAULT BASE FSTAB, UNCONFIGURED
proc /proc proc noauto 0 0
sysfs /sys sysfs noauto 0 0
/dev/sda6 / reiserfs relatime 0 0
/dev/sda5 none swap defaults 0 0
# Added by KNOPPIX
noauto,users,exec 0 0
# Added by KNOPPIX
/dev/sdb1 /media/sdb1 vfat
noauto,users,exec,umask=000,shortname=winnt,uid=kn oppix,gid=knoppix 0 0
# Added by KNOPPIX
/dev/sr0 /media/sr0 auto noauto,users,exec 0 0
# Added by KNOPPIX
/dev/sda2 /media/sda2 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppi x 0
0
# Added by KNOPPIX
/dev/sda1 /media/sda1 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppi x 0
0
# Added by KNOPPIX
/dev/sda3 /media/sda3 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppi x 0
0
b) The lines which I don't think should be there are:
# Added by KNOPPIX
noauto,users,exec 0 0
# Added by KNOPPIX
/dev/sdb1 /media/sdb1 vfat
noauto,users,exec,umask=000,shortname=winnt,uid=kn oppix,gid=knoppix 0 0
c) SO (*** MAIN QUESTIONS ***):
(i) AM I RIGHT ABOUT "b)"?
(ii) DO I JUST NEED TO RE-CREATE /etc/fstab, AND IF SO HOW DO I DO THAT?
(iii) BUT I THINK /etc/fstab IS GETTING THE INFO FOR LINE "/dev/sdb1 /media/sdb1
vfat ..." FROM A FILE SOMEWHERE ON THE SYSTEM, BECAUSE THERE IS *NO* MEMORY
STICK PRESENTLY IN ANY USB SLOT SINCE BOOT-UP (WHICH IS WHAT WOULD NORMALLY
CAUSE THAT LINE TO BE THERE I BELIEVE). IF IT *IS* GETTING THE INFO FROM A
FILE, HOW DO I FIX THAT PLEASE?
(iv) I THINK THIS WHOLE ISSUE MAY HAVE CAUSED 15 NEW ENTRIES TO APPEAR IN /dev,
IE /dev/sdb1 to sdb15. WHY IS THIS? AND DOES IT MATTER? (See 6.)
----------------------------------------------------------------------------
Full Details:
2. a) I recently wiped (intentionally) the entire contents of a USB memory stick
using the following method:
b) Plugged 2Gb memory stick into a USB slot. I let the system detect and mount
it. "mount" returned the following info:
/dev/sdb1 on /media/sdb1 type reiserfs (rw,nosuid,nodev,relatime)
c) In a terminal I ran
dd if=/dev/zero of=/dev/sdb1
This writes all zeros to the entire memory stick.
d) I unmounted the stick with I believe
umount /dev/sdb1
But this caused the entire system to hang. Not even CTRL+ALT+BACKSPACE or
CTRL+ALT+DEL could make it respond. I realised that there was NO filesystem
anymore on the stick to be actually unmounted.
3. When I rebooted, in pcmanfm filemanager, at the left was a device icon
labelled "sdb1", but there was NO memory stick plugged in any USB socket.
"mount" gave the following info (which doesn't show "sdb1"):
/dev/root on / type reiserfs (rw,relatime)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
usbfs on /proc/bus/usb type usbfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,relatime,size=2097152k)
udev on /dev type tmpfs (rw,relatime,size=20480k)
tmpfs on /dev/shm type tmpfs (rw,relatime,size=2097152k)
devpts on /dev/pts type devpts (rw,relatime,mode=1777)
4. Then I looked in /etc/fstab, which is shown at 1.a). I don't think the lines
that I've shown at 1.b) should be in /etc/fstab. In particular, it looks as
though it is the entry "/dev/sdb1 /media/sdb1 vfat ..." that is causing pcmanfm
to think that such a device is present. But there is no memory stick (or
anything else) plugged into any USB slot.
5. So the umount that I did at 2.d) (and the crash) seems to have caused this
situation.
6. Also, I've noticed that in /dev there are 15 files (block devices) called
/dev/sdb1 to sdb15. I seem to think that they weren't there before. In fact
there seem to be a lot of other entries in /dev that I don't recall being there
before, such as /dev/sdg1 to sdg15. Does this matter, and is it linked to the
umount crash?
7. I would be everso grateful if you could suggest possible answers to my
questions at 1.c).
Many thanks. John