12-05-2012
[SOLVED] Dual boot Windows 7 and Ubuntu on USB
I am trying to dual boot on an external USB 500GB drive using my laptop.I have Windows 7 installed and booting on 1st partition 230GB now as active primary, 2nd partition is 100GB as primary, and 3rd partition is 135GB as primary. I was intending on installing Ubuntu onto the 2nd partition. I read the article "How to dual boot Windows XP and Linux (XP installed first) -- the step-by-step guide with screenshots". It seems to say that Ubuntu will install alongside Windows in the same partition. Is this true? Can it be installed into it's own partition and dual boot along with windows? Thanks.
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LEARN ABOUT FREEBSD
gptboot
GPTBOOT(8) BSD System Manager's Manual GPTBOOT(8)
NAME
gptboot -- GPT bootcode for UFS on BIOS-based computers
DESCRIPTION
gptboot is used on BIOS-based computers to boot from a UFS partition on a GPT-partitioned disk. gptboot is installed in a freebsd-boot par-
tition with gpart(8).
IMPLEMENTATION NOTES
The GPT standard allows a variable number of partitions, but gptboot only boots from tables with 128 partitions or less.
PARTITION ATTRIBUTES
gptboot checks and manages several attributes of GPT UFS partitions.
bootme Attempt to boot from this partition. If more than one partition has the bootme attribute set, gptboot will attempt to boot each
one until successful.
bootonce Attempt to boot from this partition only one time. Setting this attribute with gpart(8) automatically also sets the bootme
attribute. Multiple partitions may have the bootonce and bootme attributes set.
bootfailed The bootfailed attribute marks partitions that had the bootonce attribute set, but failed to boot. This attribute is managed by
the system. See BOOTING and POST-BOOT ACTIONS below for details.
USAGE
For normal usage, the user does not have to set or manage any of the partition attributes. gptboot will boot from the first UFS partition
found.
The bootonce attribute can be used for testing an upgraded operating system on an already-working computer. The existing system partition is
left untouched, and the new version of the operating system to be tested is installed on another partition. The bootonce attribute is set on
that new test partition. The next boot is attempted from the test partition. Success or failure will be shown in the system log files.
After a successful boot of the test partition, a user script can check the logs and change the bootme attributes so the test partition
becomes the new system partition. Because the bootonce attribute is cleared after an attempted boot, a failed boot will not leave the system
attempting to boot from a partition that will never succeed. Instead, the system will boot from the older, known-working operating system
that has not been modified. If the bootme attribute is set on any partitions, booting will be attempted from them first. If no partitions
with bootme attributes are found, booting will be attempted from the first UFS partition found.
BOOTING
gptboot first reads the partition table. All freebsd-ufs partitions with only the bootonce attribute set, indicating a failed boot, are set
to bootfailed. gptboot then scans through all of the freebsd-ufs partitions. Boot behavior depends on the combination of bootme and
bootonce attributes set on those partitions.
bootonce + bootme Highest priority: booting is attempted from each of the freebsd-ufs partitions with both of these attributes. On each
partition, the bootme attribute is removed and the boot attempted.
bootme Middle priority: booting is attempted from each of the freebsd-ufs partitions with the bootme attribute.
If neither bootonce nor bootme attributes are found on any partitions, booting is attempted from the first freebsd-ufs partition on the disk.
POST-BOOT ACTIONS
The startup script /etc/rc.d/gptboot checks the attributes of freebsd-ufs partitions on all GPT disks. Partitions with the bootfailed
attribute generate a ``boot from X failed'' system log message. Partitions with only the bootonce attribute, indicating a partition that
successfully booted, generate a ``boot from X succeeded'' system log message. The bootfailed attributes are cleared from all the partitions.
The bootonce attribute is cleared from the partition that successfully booted. There is normally only one of these.
FILES
/boot/gptboot bootcode binary
/boot.config parameters for the boot blocks (optional)
EXAMPLES
gptboot is installed in a freebsd-boot partition, usually the first partition on the disk. A ``protective MBR'' (see gpart(8)) is typically
installed in combination with gptboot.
Install gptboot on the ada0 drive:
gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 ada0
gptboot can also be installed without the PMBR:
gpart bootcode -p /boot/gptboot -i 1 ada0
Set the bootme attribute for partition 2:
gpart set -a bootme -i 2 ada0
Set the bootonce attribute for partition 2, automatically also setting the bootme attribute:
gpart set -a bootonce -i 2 ada0
SEE ALSO
boot.config(5), rc.conf(5), boot(8), gpart(8)
HISTORY
gptboot appeared in FreeBSD 7.1.
AUTHORS
This manual page written by Warren Block <wblock@FreeBSD.org>.
BSD
February 5, 2014 BSD