[clug] 3TB (4k sector) disk question

Eyal Lebedinsky eyal at eyal.emu.id.au
Sat Sep 1 02:49:42 MDT 2012

[This is up to date f16]

Today I bought a 3TB disk, which originally was in a USB3 case (now out of it).

When introduced linux (as bare SATA) it seems that a sector size of 512B is used,
and the disk size is limited.

'hdparm -I' knows that this is a native 4k disk:
	Model Number:       ST3000DM001-9YN166
	Logical  Sector size:                   512 bytes
	Physical Sector size:                  4096 bytes	
	Logical Sector-0 offset:                  0 bytes	
	device size with M = 1024*1024:     2861588 MBytes
	device size with M = 1000*1000:     3000592 MBytes (3000 GB)

However parted thinks otherwise (I created one large GPT partition):

# parted /dev/sdi
GNU Parted 3.0
Using /dev/sdi
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print
Model: ATA ST3000DM001-9YN1 (scsi)
Disk /dev/sdi: 2199GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name     Flags
  1      1049kB  2199GB  2199GB  ext2         primary

Note the line 'Sector size (logical/physical): 512B/512B'.

How do I make linux use 4k sector size? Or is there a jumper
on the disk? Or a special SATA command to configure the disk?

Also, should GPT not be able to create very large disks even with 512B
sectors, using the 64bit internal pointers/sizes/etc.? Where is the
disk size limit coming from?


Eyal Lebedinsky	(eyal at eyal.emu.id.au)

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