non-ATA66 cable

[barbara]

# uname -a
FreeBSD satanasso.local.net 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Thu May 14 23:54:57 CEST 2009     root at satanasso.local.net:/usr/obj/usr/src/sys/SATANASSO  i386


In my dmesg I have:
atapci2: <VIA 8237A UDMA133 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xfc00-0xfc0f at device 15.1 on pci0
ata0: <ATA channel 0> on atapci2
...
ad0: DMA limited to UDMA33, device found non-ATA66 cable
ad0: 152627MB <MAXTOR STM3160212A 3.AAJ> at ata0-master UDMA33
...
ad1: 117246MB <Maxtor 6Y120L0 YAR41BW0> at ata0-slave UDMA133

# atacontrol info ata0
Master:  ad0 <MAXTOR STM3160212A/3.AAJ> ATA/ATAPI revision 7
Slave:   ad1 <Maxtor 6Y120L0/YAR41BW0> ATA/ATAPI revision 7

So why ad1 isn't limited too, being attached with the same cable?

On 7-STABLE, I have:
ad0: 152627MB <MAXTOR STM3160212A 3.AAJ> at ata0-master UDMA100

Thanks.