parte del error al bootear es este[*] PC BIOS (MSDOS partition tables) support
[*] BSD disklabel (FreeBSD partition tables) support
<*> UFS file system support (read only)
[*] UFS file system write support (DANGEROUS)
[*] UFS debugging
tambien trate conectandolo asi a la fuerza sin apagar el computador y me salio lo siguiente en un dmesgUDF_fs: error (device sda1) udf_read_tagged: read failed, block=256 location=256
UDF_fs: warning device (dev_sda1) udf_super: not found(1)
no filesystem could mount root, tried ext2 ext3 ext4 fat msdos iso9660 ntfs ufs udf
kernel panic not syncing: VFS: unable to mount root fs on unknown_block(8,1)
pid 1 comm: swapper/o not tainted 3.5.4-gentoo-gnu #3
[31088.312546] sd 1:0:0:0: [sdc] 312581808 512-byte logical blocks: (160 GB/149 GiB)
[31088.312737] sd 1:0:0:0: [sdc] Write Protect is off
[31088.312743] sd 1:0:0:0: [sdc] Mode Sense: 00 3a 00 00
[31088.312819] sd 1:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[31088.370239] sdc: sdc1 sdc2 sdc3
[31088.370943] sd 1:0:0:0: [sdc] Attached SCSI disk
[31126.432142] UFSD (fs/ufs/super.c, 713): ufs_fill_super:ENTER
[31126.432148] UFSD (fs/ufs/super.c, 720): ufs_fill_super:flag 0
[31126.432150] UFSD (fs/ufs/super.c, 401): ufs_parse_options:ENTER
[31126.432154] You didn't specify the type of your ufs filesystem
mount -t ufs -o ufstype=sun|sunx86|44bsd|ufs2|5xbsd|old|hp|nextstep|nextstep-cd|openstep ...
>>>WARNING<<< Wrong ufstype may corrupt your filesystem, default is ufstype=old
[31126.432159] UFSD (fs/ufs/super.c, 816): ufs_fill_super:ufstype=old
[31126.432161] ufstype=old is supported read-only
[31126.436688] ufs_read_super: bad magic number
[31126.436692] UFSD (fs/ufs/super.c, 1186): ufs_fill_super:EXIT (FAILED)
para poder ingresar a gentoo tengo que desconectar el disco donde tengo instalado freebsd, no se que me haga falta. alguna idea?

