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Parted and disk alignment
Posted on 03-15-2014 03:55:03 UTC | Updated on 03-15-2014 03:58:41 UTC
Section: /software/parted/ | Permanent Link

I always seem to come across this error every time I'm trying to partition a drive with parted. I want to use the whole drive, but I can never seem to get the alignment right. When you try to partition a drive using parted and you do the "mkpart" command you have to choose partition name, file system type, start, and end. The start and end is where I have the issue. Do I start on zero or 1 and how do I easily know what the end of the disk is? When you do this wrong the error you usually get is "Warning: The resulting partition is not properly aligned for best performance.". That error does not inspire confidence. Here is the best way I have found to use the full disk size with 1 partition.

When asked about start and end we are going to use percentages like so.

(parted) mkpart 
Partition name?  []? 1                                                    
File system type?  [ext2]? ext4                                           
Start? 0%                                                                 
End? 100%

You could also do this from the command line like

sudo parted /dev/sda mkpart primary ext4 0% 100%

Doing this will leave some free space at the start and end of the disk, but it will make sure the partition is properly aligned for best performance.

(parted) print free                                                       
Model: ATA SAMSUNG SSD 830 (scsi)
Disk /dev/sda: 128GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name     Flags
        17.4kB  1049kB  1031kB  Free Space
 1      1049kB  128GB   128GB                primary
        128GB   128GB   335kB   Free Space

One last check for alignment.

(parted) align-check opt 1                                                
1 aligned

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