Hi! I have got no effective answer for my question from other lists including the original hardware manufacturer. This list is my last resort. The main board's model name is PSCH-L from Asus. It glues two chips: Promise PDC20319 controlling 4 SATA slots for hard disks. Intel FWE6300ESB controlling 2 SATA slots for hard disks. The board also burns a firmware called FastTrak or FastBuild which manages the Promise chip I guess. My problem is that I can't find the devices controlled by either of the two chips: # fdisk /dev/sda Unable to open /dev/sda Same to /dev/sdb, sdc, sdd, sde, etc... Drivers "Promise SATA SX4" and "ata-piix/ICH" are compiled in the boot kernel. This is the excerpt from the output of dmesg: =====BEGIN=========== Linux version 2.6.14.3 (root@xxxxxxxxxxxxxxxxxxxx) (gcc version 2.95.4 20011002 (Debian prerelease)) #2 PREEMPT Sat Aug 5 02:31:01 CST 2006 [snip] Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx Probing IDE interface ide0... hda: Maxtor 91021U2, ATA DISK drive hdb: Maxtor 91021U2, ATA DISK drive Probing IDE interface ide1... ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 hda: max request size: 128KiB hda: 20010816 sectors (10245 MB) w/512KiB Cache, CHS=19852/16/63 hda: cache flushes not supported hda: hda1 hdb: max request size: 128KiB hdb: 20010816 sectors (10245 MB) w/512KiB Cache, CHS=19852/16/63 hdb: cache flushes not supported hdb: hdb1 libata version 1.12 loaded. sata_promise version 1.02 PCI: Hardcoded IRQ 9 for device 0000:02:05.0 ata1: SATA max UDMA/133 cmd 0xF8800200 ctl 0xF8800238 bmdma 0x0 irq 9 ata2: SATA max UDMA/133 cmd 0xF8800280 ctl 0xF88002B8 bmdma 0x0 irq 9 ata3: SATA max UDMA/133 cmd 0xF8800300 ctl 0xF8800338 bmdma 0x0 irq 9 ata4: SATA max UDMA/133 cmd 0xF8800380 ctl 0xF88003B8 bmdma 0x0 irq 9 ata1: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata1: dev 0 ATA, max UDMA/133, 240121728 sectors: ata1: dev 0 configured for UDMA/133 scsi0 : sata_promise ata2: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata2: dev 0 ATA, max UDMA/133, 240121728 sectors: ata2: dev 0 configured for UDMA/133 scsi1 : sata_promise ata3: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata3: dev 0 ATA, max UDMA/133, 240121728 sectors: ata3: dev 0 configured for UDMA/133 scsi2 : sata_promise ata4: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:407f ata4: dev 0 ATA, max UDMA/133, 240121728 sectors: ata4: dev 0 configured for UDMA/133 scsi3 : sata_promise Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 Vendor: ATA Model: Maxtor 6Y120M0 Rev: YAR5 Type: Direct-Access ANSI SCSI revision: 05 =====END=========== "fdisk -l" lists nothing except /dev/hda1. Where are the right /dev/ for these SATA disks? Your helps are much appreciated. Regards, CN -- http://www.fastmail.fm - Faster than the air-speed velocity of an unladen european swallow - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html