Windows 10: after aligning partitions - windows update just flashes and exits

After cloning an HDD to an SSD, and successfully being able to run Windows 10 Pro 64 bit on the SSD, I tried using partition wizard to realign the partitions on the Windows 10 disk 4 disks 5 partitions per disk on my system, boot partition is on disk0, Windows 10 is on disk3. After the realign, Windows 10 boots up OK, but trying to run Windows update just flashes the screen and immediately exits. I tried it in safe mode, and get "something went wrong ...". Since I didn't trust it, before doing the realign, I did a system image backup, which included the boot partition, and all five parti

:)

 

Partition Alignment Spreadsheet

Jason,

I have a suggestion. How about updating the spreadsheet to have a section "Proposed remedy"

What it would do is calculate how many bytes you have to move the partition forwards or backwards to achieve alignment. That way, we can just use the resulting data in a partition manager to fix it.

 

W7 Hard drive partition issue

to get rid of that 100 meg windows partition that setup creates for you on a new install on a blank hdd:

- press shift+f10 when on the partition management screen in setup <-- this opens a command prompt
- diskpart <-- start the windows command line partition management tool
- list disk <--- list the installed hdds in this computer for the next step
- select disk 0 <- might have to replace 0 with the number of the correct disk
- clean <-- this will erase all data on the disk you selected one step up- dont use the wrong disk!
- create partition primary <- creates a primary partition taking up all space on the drive, adjust the command if necessary
- exit, exit to exit diskpart and the command prompt
- click refresh in partition manager and select your newly created partition and install to that

 

Partition Alignment Spreadsheet

I created an excel spreadsheet that auto-calculates whether your raid array is properly aligned. It also auto-calculates non-raid partitions. You must meet the requirements of all Rules to be considered Aligned.

Using this spreadsheet's calculations, TechPowerUp!'s W1zzard wrote a great Javascript applet that calculates SSD alignment without the need to download the spreadsheet! The Javascript applet is linked below.

You must input your own data. It will not fetch your system information automatically. That's why the example column is there.

Let me know of any corrections or additions I can make to the sheet.

Partition alignment is the single most important performance tweak you can do for any SSD.

Lets break it down to it's simplist form. The SSD is divided into Blocks of 512k which are divided into pages of 4k in most cases. 128 pages = 1 block.

There is a certain amount of space before the start of the first partition, which is what is referred to as the offset. Vista and W7 use a default offset of 1024k, meaning there's 1024k of empty space before the partition. Starting at 1024k means that the partition starts at the beginning of the third block, since blocks are 512k (512k x 2 = 1024k).

The goal is to not start a partition in the middle of a block or a page. That way, you don't split any boundaries. If you split a page (4k) section, then 2 writes are necessary to write the page instead of 1, doubling the work. It will happen repeatively every 8th page, reducing overall performance and I/O commands. Blocks have a similar performance hit but not to the same degree as pages. It's easy to align to both.

Alignment has to be done when the partition is created. There are tools such as a gparted boot CD that can change alignment after it's created, but it's not 100%. Sometimes, you can lose your data with that method. It's best to fresh install and correctly create the partition at the beginning. Windows Vista/7 will both correctly align a partition. You must not have any previous partitions on the SSD and allow Windows to create and quick format the partition during the installation procedure.

WinXP is another story because it will not align a partition correctly by default. Extra steps are involved. The easiest way to align a WinXP OS volume is to get the downloadable Vista Recovery DVD and create the OS partition before the installation of WinXP. The partition created by the Vista Recovery DVD will be the same as the Vista Installation DVD and will be aligned at 1024kb by default which is a valid alignment for todays hardware.

It takes a moment to wrap your head around the new technology, but the sooner you forget HDDs, sectors, tracks, and cylinders, the better off you'll be. It's all about the blocks and pages now.

Online SSD Alignment Calculator written by TechPowerUp!'s W1zzard.

VBScript Alignment Checking Tool originally written by TcpDump's Tom Hirt. Discovered by Halk and edited by me to work with all SSDs with 512kb block sizes.

SSD Alignment Spreadsheet created by me.

Jason