Trouble with drive size detection - 31MB visible size on 1TB drive.

[KOT MATPOCKuH]

Hi all!

I have a problem with drive size detection.
After any power cycle my HDD ST31000340NS detected by FreeBSD 7.2 as 31Mb drive.
For example:
Dec  9 20:33:12 green kernel: ad14: 31MB <Seagate ST31000340NS SN06>
at ata7-master SATA300
Dec  9 20:33:12 green kernel: GEOM: ad14: corrupt or invalid GPT detected.
Dec  9 20:33:12 green kernel: GEOM: ad14: GPT rejected -- may not be
recoverable.

# atacontrol cap ad14
[skipped]
cylinders             64
heads                 16
sectors/track         63
lba supported         65134 sectors
lba48 supported       65134 sectors

# smartctl -a /dev/ad14
[skipped]
User Capacity:    33,348,608 bytes

I'm tried to reinit/detach/attach drive via atacontrol, but have no result.
But after reboot the system in linux and then back to FreeBSD, I have
correct disk geometry:
ad14: 953869MB <Seagate ST31000340NS SN06> at ata7-master SATA300

In linux's dmesg.out I found this messages:
[    8.984053] ata6: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    9.120175] ata6.00: HPA unlocked: 65134 -> 1953525168, native 1953525168
[    9.120180] ata6.00: ATA-8: ST31000340NS, SN06, max UDMA/133
[    9.120183] ata6.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 31/32)
[    9.179789] ata6.00: configured for UDMA/133
[    9.179851] scsi 5:0:0:0: Direct-Access     ATA      ST31000340NS
  SN06 PQ: 0 ANSI: 5
[    9.179960] sd 5:0:0:0: Attached scsi generic sg5 type 0
[    9.179992] sd 5:0:0:0: [sdf] 1953525168 512-byte logical blocks: (1.00 TB/93
1 GiB)
[    9.180041] sd 5:0:0:0: [sdf] Write Protect is off
[    9.180044] sd 5:0:0:0: [sdf] Mode Sense: 00 3a 00 00
[    9.180066] sd 5:0:0:0: [sdf] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA

What is HPA? Why drive locks HPA? And... Can I unlock HPA from FreeBSD?

-- 
MATPOCKuH