LinuxQuestions.org - Hotplugging SATA drives

Hello.

I have a motherboard with Intel ICH6R SATA controller. I use AHCI mode in BIOS and the AHCI linux ATA driver of course which
supports hotplugging.

My motherboard has a bracket that it is used to take internal sata and make it external (no e-sata then).
I have tried it some times to plug in or out my second disk and transfer data. The whole procedure is done ok and the data appear
without errors, but i get some kernel errors.

I put the disk today with the machine powered off and transferred the data and then plugged it off.

The kernel messages i got are the following:

Code:

ata4: exception Emask 0x10 SAct 0x0 SErr 0x10000 action 0x2 frozen

ata4: (irq_stat 0x00400000, PHY RDY changed)

ata4: soft resetting port

ata4: SATA link down (SStatus 11 SControl 300)

ata4: failed to recover some devices, retrying in 5 secs

ata4: hard resetting port

ata4: SATA link down (SStatus 0 SControl 300)

ata4.00: limiting speed to UDMA/133:PIO3

ata4: failed to recover some devices, retrying in 5 secs

ata4: hard resetting port

ata4: SATA link down (SStatus 0 SControl 300)

ata4.00: disabled

ata4: EH complete

ata4.00: detaching (SCSI 3:0:0:0)

Synchronizing SCSI cache for disk sdb:

FAILED

  status = 0, message = 00, host = 4, driver = 00

Does anyone use external SATA drives / hotplugging ?
Do i need to use some command before plugging it off ? (With SCSI i echo add or remove device > /proc/scsi/scsi) but i haven't
tried it with SATA.

Thank you for your time.