[clug] 3TB (4k sector) disk question
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
Welcome to GNU Parted! Type 'help' to view a list of commands.
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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