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Let grub re-scan disks?
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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
I placed a entry like this in grub4dos,
rootnoverify (hd1)
chainloader +1
boot
But sometimes when I plug in my USB key too late, grub will not detect this usb key, is there anyway to let grub re-scan disk list?
I need to know for both grub0.9X and grub1.9X
grub
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
add a comment |
I placed a entry like this in grub4dos,
rootnoverify (hd1)
chainloader +1
boot
But sometimes when I plug in my USB key too late, grub will not detect this usb key, is there anyway to let grub re-scan disk list?
I need to know for both grub0.9X and grub1.9X
grub
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
add a comment |
I placed a entry like this in grub4dos,
rootnoverify (hd1)
chainloader +1
boot
But sometimes when I plug in my USB key too late, grub will not detect this usb key, is there anyway to let grub re-scan disk list?
I need to know for both grub0.9X and grub1.9X
grub
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
I placed a entry like this in grub4dos,
rootnoverify (hd1)
chainloader +1
boot
But sometimes when I plug in my USB key too late, grub will not detect this usb key, is there anyway to let grub re-scan disk list?
I need to know for both grub0.9X and grub1.9X
grub
grub
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
edited Oct 7 '12 at 5:03
daisy
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
asked Oct 5 '12 at 4:24
daisydaisy
29.7k51177309
29.7k51177309
add a comment |
add a comment |
5 Answers
5
active
oldest
votes
Run the following command as root:
update-grub
EDIT: This is an Ubuntu specific command. To do this on another distribution, just run grub-mkconfig -o /boot/grub/grub.cfg
2nd EDIT: os-prober is required for that to work (automatically detect operating systems and add menu entries for them).
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
add a comment |
Grub does not provide an explicit command to rescan drives, but the drives will be rescanned if the computer is rebooted from within grub. To do this:
- At the grub menu, press
cto drop to the grub console - Type
rebootand hit enter - Computer will reboot
- Grub will be reloaded and the drives will be rescanned
answered Jan 30 '16 at 10:26
bainbain
1545
add a comment |
From what I've seen, I don't believe this is possible. I was in a similar situation where I setup a GRUB entry to boot from a USB. If I didn't have a USB stick in before startup, the boot option fails. If I boot with the USB stick already connected, the option would boot from the USB.
Using GRUB 0.97, I've scanned the manual and tried many commands but I didn't see anything related to re-initializing the disks.
I see many hints in the manual that GRUB relies on the BIOS (if not entirely). When playing with boot options from the BIOS, it's in the same situation where if I don't have the USB stick plugged in before BIOS starts, it will never be listed as a bootable option (using AMI, Aptio). Maybe this is a BIOS limitation, a limitation of both or I could just strayed on a tangent.
I thought this was going to be an issue for me, but then I wondered what was easier: having someone toggle to the GRUB command mode and reinitialize disks or just CTRL-ALT-DEL'ing...
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
add a comment |
Hi guys I was having this a issue where i installed red hat enterprise linux and grub would not give me the option to dual boot. It only had linux as a option but not my windows os. i couldn't figure it out for a while until it hit me like a ton of bricks lol. I think God was helping me out. All you have to do is run the "os-prober" command on the terminal if you have red hat or centos. IF THIS DOES NOT WORK!? Its because your system is unable to read "ntfs" partitions, which are windows partitions. So to fix this install the package "ntfs-3g". The command will look like this:
For Red Hat and Centos
$ sudo yum install ntfs-3g
or
For Debian based or Ubuntu
$ sudo apt-get install ntfs-3g
Once its installed you can immediately run os-prober and it should work perfect. Reboot your system and you should have a choose on the grub2 menu of booting linux or windows or whatever other os you have. I hope this helps someone other there. And i hope i explained it right.
Sorry I forgot one more thing before you reboot run this as root user.
grub2-mkconfig -o /boot/grub2/grub.cfg
This command will generate a new grub.cfg file and rescan the disks and partitions. Then you can reboot the pc.
answered 39 mins ago
LionbyteLionbyte
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
yes; reboot.mod in grub ==ctrl-alt-del in common PC's.
The reason why a "late plugin usbstick" not recognised is due to hotplug concept! Since grub is at very early boot no driver for hotplug could be available.
A very simple experiment to illustrate:
- get 2 usbsticks with at least one with grub bootable
- start the pc with the bootable stick
- on grub's menu, type c to get into grub console
- grub>ls to display all drives seen by grub
- Plugin the 2nd stick
- grub>ls will see no change
- grub>reboot, then
- grub>ls will see the 2 sticks
Even in the future, hotplug will never exist in grub.
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
answered Mar 31 '16 at 11:58
wangjiwangji
1
add a comment |
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
Run the following command as root:
update-grub
EDIT: This is an Ubuntu specific command. To do this on another distribution, just run grub-mkconfig -o /boot/grub/grub.cfg
2nd EDIT: os-prober is required for that to work (automatically detect operating systems and add menu entries for them).
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
add a comment |
Run the following command as root:
update-grub
EDIT: This is an Ubuntu specific command. To do this on another distribution, just run grub-mkconfig -o /boot/grub/grub.cfg
2nd EDIT: os-prober is required for that to work (automatically detect operating systems and add menu entries for them).
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
add a comment |
Run the following command as root:
update-grub
EDIT: This is an Ubuntu specific command. To do this on another distribution, just run grub-mkconfig -o /boot/grub/grub.cfg
2nd EDIT: os-prober is required for that to work (automatically detect operating systems and add menu entries for them).
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
Run the following command as root:
update-grub
EDIT: This is an Ubuntu specific command. To do this on another distribution, just run grub-mkconfig -o /boot/grub/grub.cfg
2nd EDIT: os-prober is required for that to work (automatically detect operating systems and add menu entries for them).
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
edited Apr 17 '18 at 12:37
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
answered Oct 5 '12 at 7:23
FSMaxBFSMaxB
1889
1889
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
add a comment |
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
works on Debian too, comes with package 'grub2-common'
– golimar
Sep 8 '18 at 11:47
add a comment |
Grub does not provide an explicit command to rescan drives, but the drives will be rescanned if the computer is rebooted from within grub. To do this:
- At the grub menu, press
cto drop to the grub console - Type
rebootand hit enter - Computer will reboot
- Grub will be reloaded and the drives will be rescanned
answered Jan 30 '16 at 10:26
bainbain
1545
add a comment |
Grub does not provide an explicit command to rescan drives, but the drives will be rescanned if the computer is rebooted from within grub. To do this:
- At the grub menu, press
cto drop to the grub console - Type
rebootand hit enter - Computer will reboot
- Grub will be reloaded and the drives will be rescanned
answered Jan 30 '16 at 10:26
bainbain
1545
add a comment |
Grub does not provide an explicit command to rescan drives, but the drives will be rescanned if the computer is rebooted from within grub. To do this:
- At the grub menu, press
cto drop to the grub console - Type
rebootand hit enter - Computer will reboot
- Grub will be reloaded and the drives will be rescanned
answered Jan 30 '16 at 10:26
bainbain
1545
Grub does not provide an explicit command to rescan drives, but the drives will be rescanned if the computer is rebooted from within grub. To do this:
- At the grub menu, press
cto drop to the grub console - Type
rebootand hit enter - Computer will reboot
- Grub will be reloaded and the drives will be rescanned
answered Jan 30 '16 at 10:26
bainbain
1545
answered Jan 30 '16 at 10:26
bainbain
1545
answered Jan 30 '16 at 10:26
bainbain
1545
answered Jan 30 '16 at 10:26
bainbain
1545
1545
add a comment |
add a comment |
From what I've seen, I don't believe this is possible. I was in a similar situation where I setup a GRUB entry to boot from a USB. If I didn't have a USB stick in before startup, the boot option fails. If I boot with the USB stick already connected, the option would boot from the USB.
Using GRUB 0.97, I've scanned the manual and tried many commands but I didn't see anything related to re-initializing the disks.
I see many hints in the manual that GRUB relies on the BIOS (if not entirely). When playing with boot options from the BIOS, it's in the same situation where if I don't have the USB stick plugged in before BIOS starts, it will never be listed as a bootable option (using AMI, Aptio). Maybe this is a BIOS limitation, a limitation of both or I could just strayed on a tangent.
I thought this was going to be an issue for me, but then I wondered what was easier: having someone toggle to the GRUB command mode and reinitialize disks or just CTRL-ALT-DEL'ing...
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
add a comment |
From what I've seen, I don't believe this is possible. I was in a similar situation where I setup a GRUB entry to boot from a USB. If I didn't have a USB stick in before startup, the boot option fails. If I boot with the USB stick already connected, the option would boot from the USB.
Using GRUB 0.97, I've scanned the manual and tried many commands but I didn't see anything related to re-initializing the disks.
I see many hints in the manual that GRUB relies on the BIOS (if not entirely). When playing with boot options from the BIOS, it's in the same situation where if I don't have the USB stick plugged in before BIOS starts, it will never be listed as a bootable option (using AMI, Aptio). Maybe this is a BIOS limitation, a limitation of both or I could just strayed on a tangent.
I thought this was going to be an issue for me, but then I wondered what was easier: having someone toggle to the GRUB command mode and reinitialize disks or just CTRL-ALT-DEL'ing...
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
add a comment |
From what I've seen, I don't believe this is possible. I was in a similar situation where I setup a GRUB entry to boot from a USB. If I didn't have a USB stick in before startup, the boot option fails. If I boot with the USB stick already connected, the option would boot from the USB.
Using GRUB 0.97, I've scanned the manual and tried many commands but I didn't see anything related to re-initializing the disks.
I see many hints in the manual that GRUB relies on the BIOS (if not entirely). When playing with boot options from the BIOS, it's in the same situation where if I don't have the USB stick plugged in before BIOS starts, it will never be listed as a bootable option (using AMI, Aptio). Maybe this is a BIOS limitation, a limitation of both or I could just strayed on a tangent.
I thought this was going to be an issue for me, but then I wondered what was easier: having someone toggle to the GRUB command mode and reinitialize disks or just CTRL-ALT-DEL'ing...
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
From what I've seen, I don't believe this is possible. I was in a similar situation where I setup a GRUB entry to boot from a USB. If I didn't have a USB stick in before startup, the boot option fails. If I boot with the USB stick already connected, the option would boot from the USB.
Using GRUB 0.97, I've scanned the manual and tried many commands but I didn't see anything related to re-initializing the disks.
I see many hints in the manual that GRUB relies on the BIOS (if not entirely). When playing with boot options from the BIOS, it's in the same situation where if I don't have the USB stick plugged in before BIOS starts, it will never be listed as a bootable option (using AMI, Aptio). Maybe this is a BIOS limitation, a limitation of both or I could just strayed on a tangent.
I thought this was going to be an issue for me, but then I wondered what was easier: having someone toggle to the GRUB command mode and reinitialize disks or just CTRL-ALT-DEL'ing...
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
answered Nov 6 '14 at 23:18
jdknightjdknight
1134
1134
add a comment |
add a comment |
Hi guys I was having this a issue where i installed red hat enterprise linux and grub would not give me the option to dual boot. It only had linux as a option but not my windows os. i couldn't figure it out for a while until it hit me like a ton of bricks lol. I think God was helping me out. All you have to do is run the "os-prober" command on the terminal if you have red hat or centos. IF THIS DOES NOT WORK!? Its because your system is unable to read "ntfs" partitions, which are windows partitions. So to fix this install the package "ntfs-3g". The command will look like this:
For Red Hat and Centos
$ sudo yum install ntfs-3g
or
For Debian based or Ubuntu
$ sudo apt-get install ntfs-3g
Once its installed you can immediately run os-prober and it should work perfect. Reboot your system and you should have a choose on the grub2 menu of booting linux or windows or whatever other os you have. I hope this helps someone other there. And i hope i explained it right.
Sorry I forgot one more thing before you reboot run this as root user.
grub2-mkconfig -o /boot/grub2/grub.cfg
This command will generate a new grub.cfg file and rescan the disks and partitions. Then you can reboot the pc.
answered 39 mins ago
LionbyteLionbyte
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Hi guys I was having this a issue where i installed red hat enterprise linux and grub would not give me the option to dual boot. It only had linux as a option but not my windows os. i couldn't figure it out for a while until it hit me like a ton of bricks lol. I think God was helping me out. All you have to do is run the "os-prober" command on the terminal if you have red hat or centos. IF THIS DOES NOT WORK!? Its because your system is unable to read "ntfs" partitions, which are windows partitions. So to fix this install the package "ntfs-3g". The command will look like this:
For Red Hat and Centos
$ sudo yum install ntfs-3g
or
For Debian based or Ubuntu
$ sudo apt-get install ntfs-3g
Once its installed you can immediately run os-prober and it should work perfect. Reboot your system and you should have a choose on the grub2 menu of booting linux or windows or whatever other os you have. I hope this helps someone other there. And i hope i explained it right.
Sorry I forgot one more thing before you reboot run this as root user.
grub2-mkconfig -o /boot/grub2/grub.cfg
This command will generate a new grub.cfg file and rescan the disks and partitions. Then you can reboot the pc.
answered 39 mins ago
LionbyteLionbyte
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Hi guys I was having this a issue where i installed red hat enterprise linux and grub would not give me the option to dual boot. It only had linux as a option but not my windows os. i couldn't figure it out for a while until it hit me like a ton of bricks lol. I think God was helping me out. All you have to do is run the "os-prober" command on the terminal if you have red hat or centos. IF THIS DOES NOT WORK!? Its because your system is unable to read "ntfs" partitions, which are windows partitions. So to fix this install the package "ntfs-3g". The command will look like this:
For Red Hat and Centos
$ sudo yum install ntfs-3g
or
For Debian based or Ubuntu
$ sudo apt-get install ntfs-3g
Once its installed you can immediately run os-prober and it should work perfect. Reboot your system and you should have a choose on the grub2 menu of booting linux or windows or whatever other os you have. I hope this helps someone other there. And i hope i explained it right.
Sorry I forgot one more thing before you reboot run this as root user.
grub2-mkconfig -o /boot/grub2/grub.cfg
This command will generate a new grub.cfg file and rescan the disks and partitions. Then you can reboot the pc.
answered 39 mins ago
LionbyteLionbyte
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Hi guys I was having this a issue where i installed red hat enterprise linux and grub would not give me the option to dual boot. It only had linux as a option but not my windows os. i couldn't figure it out for a while until it hit me like a ton of bricks lol. I think God was helping me out. All you have to do is run the "os-prober" command on the terminal if you have red hat or centos. IF THIS DOES NOT WORK!? Its because your system is unable to read "ntfs" partitions, which are windows partitions. So to fix this install the package "ntfs-3g". The command will look like this:
For Red Hat and Centos
$ sudo yum install ntfs-3g
or
For Debian based or Ubuntu
$ sudo apt-get install ntfs-3g
Once its installed you can immediately run os-prober and it should work perfect. Reboot your system and you should have a choose on the grub2 menu of booting linux or windows or whatever other os you have. I hope this helps someone other there. And i hope i explained it right.
Sorry I forgot one more thing before you reboot run this as root user.
grub2-mkconfig -o /boot/grub2/grub.cfg
This command will generate a new grub.cfg file and rescan the disks and partitions. Then you can reboot the pc.
answered 39 mins ago
LionbyteLionbyte
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 26 mins ago
answered 39 mins ago
LionbyteLionbyte
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 39 mins ago
LionbyteLionbyte
11
answered 39 mins ago
LionbyteLionbyte
11
11
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Lionbyte is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
yes; reboot.mod in grub ==ctrl-alt-del in common PC's.
The reason why a "late plugin usbstick" not recognised is due to hotplug concept! Since grub is at very early boot no driver for hotplug could be available.
A very simple experiment to illustrate:
- get 2 usbsticks with at least one with grub bootable
- start the pc with the bootable stick
- on grub's menu, type c to get into grub console
- grub>ls to display all drives seen by grub
- Plugin the 2nd stick
- grub>ls will see no change
- grub>reboot, then
- grub>ls will see the 2 sticks
Even in the future, hotplug will never exist in grub.
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
answered Mar 31 '16 at 11:58
wangjiwangji
1
add a comment |
yes; reboot.mod in grub ==ctrl-alt-del in common PC's.
The reason why a "late plugin usbstick" not recognised is due to hotplug concept! Since grub is at very early boot no driver for hotplug could be available.
A very simple experiment to illustrate:
- get 2 usbsticks with at least one with grub bootable
- start the pc with the bootable stick
- on grub's menu, type c to get into grub console
- grub>ls to display all drives seen by grub
- Plugin the 2nd stick
- grub>ls will see no change
- grub>reboot, then
- grub>ls will see the 2 sticks
Even in the future, hotplug will never exist in grub.
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
answered Mar 31 '16 at 11:58
wangjiwangji
1
add a comment |
yes; reboot.mod in grub ==ctrl-alt-del in common PC's.
The reason why a "late plugin usbstick" not recognised is due to hotplug concept! Since grub is at very early boot no driver for hotplug could be available.
A very simple experiment to illustrate:
- get 2 usbsticks with at least one with grub bootable
- start the pc with the bootable stick
- on grub's menu, type c to get into grub console
- grub>ls to display all drives seen by grub
- Plugin the 2nd stick
- grub>ls will see no change
- grub>reboot, then
- grub>ls will see the 2 sticks
Even in the future, hotplug will never exist in grub.
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
answered Mar 31 '16 at 11:58
wangjiwangji
1
yes; reboot.mod in grub ==ctrl-alt-del in common PC's.
The reason why a "late plugin usbstick" not recognised is due to hotplug concept! Since grub is at very early boot no driver for hotplug could be available.
A very simple experiment to illustrate:
- get 2 usbsticks with at least one with grub bootable
- start the pc with the bootable stick
- on grub's menu, type c to get into grub console
- grub>ls to display all drives seen by grub
- Plugin the 2nd stick
- grub>ls will see no change
- grub>reboot, then
- grub>ls will see the 2 sticks
Even in the future, hotplug will never exist in grub.
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
answered Mar 31 '16 at 11:58
wangjiwangji
1
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
edited Mar 31 '16 at 12:28
Jeff Schaller♦
46.4k1166150
46.4k1166150
answered Mar 31 '16 at 11:58
wangjiwangji
1
answered Mar 31 '16 at 11:58
wangjiwangji
1
answered Mar 31 '16 at 11:58
wangjiwangji
1
1
add a comment |
add a comment |
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