Re: I'd like to fix read failure issue on Mac OS X

2014/12/18 13:03, Robert S <[email protected]> wrote: 

> Been mostly lurking in this conversation, but I can think of several 
> possible reasons the sector size could be different:
> 
> 1) The drive is using HPA or DCO to hide some sectors. I've never 
> encountered DCO in the wild, but I have seen HPA twice. You can use 
> hdparm to check for both. For HPA, hdparm -N /dev/<disk id> and for DCO, 
> hdparm --dco-identify /dev/<disk id> . I'd check this first as it the 
> most likely to be correct. The rest of the reasons below are *probably* 
> not the cause of your issue.

The result of "hdparm -N" is the following:

/dev/sdb:
 max sectors   = 976773168/1(976773168?), HPA setting seems invalid (buggy kernel device driver?)

And the result of "hdparm --dco-identify" is the following:

/dev/sdb:
DCO Revision: 0x0002
The following features can be selectively disabled via DCO:
	Transfer modes:
		 mdma0 mdma1 mdma2
		 udma0 udma1 udma2 udma3 udma4 udma5 udma6
	Real max sectors: 976773168
	ATA command/feature sets:
		 SMART self_test error_log security PUIS AAM HPA 48_bit
		 FUA selective_test
		 WRITE_UNC_EXT
	SATA command/feature sets:
		 NCQ NZ_buffer_offsets interface_power_management SSP

So, my hdd seems to using DCO.  Please let me know next step.  
 
> 2) The drive is an AF drive and the tools you are using are pre-AF drive 
> tools. Most tools were updated years ago, so this is probably not the 
> correct answer unless you are using really old tools.

AF means Advanced Format?  Same meaning as AFT=Advanced Format Technology?

> 3) You have mentioned this is an external drive, but didn't say which 
> one. 
[SNIP]

Information about my hdd is the following:

$ smartctl -i /dev/disk5
smartctl 6.3 2014-07-26 r3976 [x86_64-apple-darwin13.4.0] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Hitachi Travelstar 5K500.B
Device Model:     Hitachi HTS545050B9A300
Serial Number:    091227PBG406Q7K6SKNV
LU WWN Device Id: 5 000cca 597ed5937
Firmware Version: PB4OC64G
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    5400 rpm
Form Factor:      2.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 6
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Thu Dec 18 14:27:12 2014 JST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled


> 4) The GPT specification explicitly requires its EFI GPT (0xEE) 
> partition in the protective MBR to have CHS values that aren't 
> technically legal.

Here's result of "fdisk -lu".  Is this related with your comment?

Disk /dev/sdb: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 7CC20A1E-BC90-49FF-90E9-7384F28833E8

Device      Start       End   Sectors   Size Type
/dev/sdb1      40    409639    409600   200M EFI System
/dev/sdb2  409640 976510983 976101344 465.5G Apple HFS/HFS+

Disk /dev/loop0: 425.6 MiB, 446214144 bytes, 871512 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Best Regards,

// Miya

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