SATA と USB とはどちらが優先？

SATA と USB と両方の HDD を接続すると、どちらが先に認識される？
予想結果は内蔵SATA → 外付けSATA(eSATA) → USB

hackkit:~# dmesg
	:
	:
Intergrated Sata device found
scsi0 : Marvell SCSI to SATA adapter
scsi1 : Marvell SCSI to SATA adapter
  Vendor: Seagate   Model: ST3120026AS       Rev: 3.18
  Type:   Direct-Access                      ANSI SCSI revision: 03
  Vendor: Hitachi   Model: HDT722525DLA380   Rev: V44O
  Type:   Direct-Access                      ANSI SCSI revision: 03
SCSI device sda: 234441648 512-byte hdwr sectors (120034 MB)
SCSI device sda: drive cache: write back
SCSI device sda: 234441648 512-byte hdwr sectors (120034 MB)
SCSI device sda: drive cache: write back
 sda: sda1 sda2 sda3 sda4
Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
SCSI device sdb: 488397168 512-byte hdwr sectors (250059 MB)
SCSI device sdb: drive cache: write back
SCSI device sdb: 488397168 512-byte hdwr sectors (250059 MB)
SCSI device sdb: drive cache: write back
 sdb: sdb1
Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0
Attached scsi generic sg0 at scsi0, channel 0, id 0, lun 0,  type 0
Attached scsi generic sg1 at scsi1, channel 0, id 0, lun 0,  type 0
	:
	:
  Vendor: Hitachi   Model: HDT725025VLAT80   Rev: V5DO
  Type:   Direct-Access                      ANSI SCSI revision: 02
SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB)
sdc: assuming drive cache: write through
SCSI device sdc: 488397168 512-byte hdwr sectors (250059 MB)
sdc: assuming drive cache: write through
 sdc: sdc1
Attached scsi disk sdc at scsi2, channel 0, id 0, lun 0
Attached scsi generic sg2 at scsi2, channel 0, id 0, lun 0,  type 0
	:
	:

というわけで、
sda 内蔵 SATA(ST3120026AS)
sdb サブボードの SATA(HDT722525DLA380)
sdc USB(HDT725025VLAT80)
と、予想通り

もうちょっとでテラか、、、、

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SATA と USB とはどちらが速い？