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The Second OS won't run from GRUB




My HDD status is below.

(parted) print all
Model: ATA ST3320418AS (scsi)
Disk /dev/sda: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End    Size    Type      File system     Flags
 1      1049kB  318GB  318GB   primary   ext4            boot
 2      318GB   320GB  2011MB  extended
 5      318GB   320GB  2011MB  logical   linux-swap(v1)


Model: ATA HDS728080PLAT20 (scsi)
Disk /dev/sdb: 82.3GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name  Flags
 1      20.5kB  545kB   524kB
 2      545kB   78.4GB  78.4GB  freebsd-ufs
 3      78.4GB  82.3GB  3964MB

How would I edit /etc/grub.d/40_custom?