Is my Crucial SSD correctly aligned?

I've installed Arch Linux on my Crucial M4 SSD after installing Windows 8. After doing this, I started to read about correct alignment and how important it is supposed be.
But to be honest, I didn't really understand yet whether my SSD is correctly aligned, or not.
I'd be very thankful if you could tell me.
Last edited by stecklars (2013-11-09 12:15:12)

teateawhy wrote:
There is also:
blockdev --getalignoff /dev/sdb1
If it outputs 0, the partition should be aligned.
Nice tip. Added it to the wiki.[1]
1. https://wiki.archlinux.org/index.php/So … _Alignment

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Installed m4 crucial SSD and I cannon erase and format new drive. I get an error "wiping volume data to prevent future accidental probing failed"

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Hello,
This post is directed at someotherguy because it is a follow through from another post.
I am opening a new thread because I think it is appropriate.
I took you advice in this thread: <link here> and used the password in the firmware to encrypt my SSD and abandoned
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Solved!
Go to Solution.

Hi,
Someotherguy, Brendanhoar, ColonelONeil: Thanks for all the help. I used a little from everyone and got my drive encrypted. Completely gave up on bitlocker, couldn't get it to work properly. At some stage you have to give up and move on. I'm using the SEP and Firmware option for encrypting my data.
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What is the correct way to transfer data from old hard drive to new Crucial SSD on a mid 2010 13" MBP

I just bought an Crucial M550 256GB for my mid 2010 MBP. And I'm not clear on the data transfer instructions.
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Well, I am not familiar with the Crucial kit you got - you might want to ask them about that blank CD...... however, I did install an SSD and this is what I did:
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[SSD], are my partitions (correctly) aligned?

OCZ Agility 3 (SATA2 limited)
hdparm -I /dev/sdb
/dev/sdb:
ATA device, with non-removable media
Model Number: OCZ-AGILITY3
Serial Number: OCZ-U0S3NZG2420IO1W1
Firmware Revision: 2.08
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Used: unknown (minor revision code 0x0110)
Supported: 9 8 7 6 5
Likely used: 9
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
CHS current addressable sectors: 16514064
LBA user addressable sectors: 117231408
LBA48 user addressable sectors: 117231408
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 1024*1024: 57241 MBytes
device size with M = 1000*1000: 60022 MBytes (60 GB)
cache/buffer size = unknown
Nominal Media Rotation Rate: Solid State Device
fdisk -l:
$ sudo fdisk -l /dev/sdb
Disk /dev/sdb: 60.0 GB, 60022480896 bytes
255 heads, 63 sectors/track, 7297 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00025741
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 32 248832 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2 32 7298 58363905 5 Extended
/dev/sdb5 32 7298 58363904 83 Linux
sectors:
Command (m for help): p
Disk /dev/sdb: 60.0 GB, 60022480896 bytes
255 heads, 63 sectors/track, 7297 cylinders, total 117231408 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
Disk identifier: 0x00025741
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 499711 248832 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2 501758 117229567 58363905 5 Extended
/dev/sdb5 501760 117229567 58363904 83 Linux
sdb1 is /boot
sdb2 is the extended partition in which the logical partition sdb5 resides. sdb5 has a LUKS container (setup with default parameters), then a LVM physical volume is created (default params) in that (takes all the space).
On the PV we have a VG that takes all space, and in that VG I have a 20GB root, 512MB swap and the rest for home ( ~35.16GB).
I guess I've a few questions, first, are the partitions aligned on the SSD? Secondly, when you create a LUKS container, do you need to do something special in order to have it aligned?
Many thanks!

alphaniner wrote:Did you check out the wiki entry on SSDs? It recommends using GPT, but also explains how to ensure proper alignment with MBR.
I'm checking it out now. This is actually a Lubuntu install, so it did all the partitioning etc itself. I'm beginning to suspect that I have to redo everything manually!
edit:
parted /dev/sdb print wrote:
Disk /dev/sdb: 60.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Number Start End Size Type File system Flags
1 1049kB 256MB 255MB primary ext2 boot
2 257MB 60.0GB 59.8GB extended
5 257MB 60.0GB 59.8GB logical
fdisk -H 32 -S 32 /dev/sdb wrote:
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): u
Changing display/entry units to sectors
Command (m for help): p
Disk /dev/sdb: 60.0 GB, 60022480896 bytes
32 heads, 32 sectors/track, 114483 cylinders, total 117231408 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
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Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 499711 248832 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2 501758 117229567 58363905 5 Extended
Partition 2 does not end on cylinder boundary.
/dev/sdb5 501760 117229567 58363904 83 Linux
Hm, looks like the first partition is at least aligned in the beginning, but I'm not sure about the end, or sdb2 or sdb5.
Last edited by Fackamato (2011-08-03 16:24:49)

Dualboot archlinux/ubuntu on SSD, partition alignement is so fun

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Answering to myself and from the man page of ext4.
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Hi cswann821,
Is the system overclocked or with default clocks?
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256 Crucial SSD upgrade

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http://support.apple.com/kb/SP500
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