By Ailsa / Last Updated March 9, 2020

Why transfer C drive to SSD?

As we all know, SSD (short for Solid State Drive) has a faster speed of reading and writing than the original hard disk (like the HDD, short for Hard Disk Drive), there is no noise when it works. That’s why so many users decide to use it as the bootable disk. Thus, the key to promoting the performance of your current computer is transfer C drive to SSD. It means that transfer your current OS to SSD disk in Windows 10/8/7, including the system files and the applications you’ve installed.

There are some circumstances you may have encountered: Your computer spends long time on booting; you got rough experience when running some large games in your computer; someday you’ll find the C drive has not enough space to run the applications correctly and smoothly, you have to increase C drive or transfer data to a larger disk, and so on.

Considering these situations, you may consider migrating C drive to SSD in Windows 7/8/8.1/10 Operating System to get better performance than before.

Preparation work for moving C drive to SSD

Maybe you desperately want to know how to transfer OS to SSD, but before that, there is something you need to prepare:

  • An SSD Disk: as the destination location to save data of C drive when you transfer C drive to SSD. Its size maybe smaller than your current hard disk, don’t worry, as long as the size of SSD disk is larger than the size of C drive, reserve some space for future extensions in SSD disk.

  • Your current computer: contains all the partitions, including System Partition (typically C drive, which you want to transfer) and other data partitions.

  • Clone HDD to SSD software: there are many tools in the market to transfer data from hard disk (HDD) to SSD, and most of users don’t know how to choose. So we recommend you an easy-to-use cloning software, AOMEI Partition Assistant Professional. It allows you to clone C drive from HDD to smaller SSD and support SSD partition alignment during cloning.

How to transfer C drive to SSD from HDD?

AOMEI Partition Assistant provides two ways to copy system drive to SSD: copy partition and migrate OS to SSD, the latter one is better than the previous one. The following text is about how to transfer C drive to SSD disk without reinstalling Windows and applications:

▶ You can download its demo version to have a free trial!

Download Demo Win 10/8.1/8/7/XP
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Step 1. Install and launch the cloning software. On the main interface, click "Migrate OS to SSD" under the left "Wizards" column.

Migrate OS to SSD

Step 2. Select an unallocated space on SSD drive. If there is no unallocated space on destination disk, select F partition on Disk 2 (SSD), make sure you have ticked the option "I want to delete all partitions on this disk 2 to migrate system to this disk", then hit "Next".

Tip: You can also move C drive to another location, like Network share, NAS device, USB flash drive, an external disk, etc. It depends on you.

Unallocated Space

Step 3. In next window, customize the size and the location of the new created G partition. Click "Next".

Resize Partition


  • Resize your partition on SSD disk to get an unallocated space if you don’t want to delete all partitions on SSD drive. And make sure the unallocated space must be larger than the size of C drive.

  • You have to backup important files on SSD disk to another location in advance.

Step 4. Ensure you have noticed how to boot OS from SSD or HDD, click "Finish" to continue.

Boot OS from SSD

Step 4. Preview the pending operations and the changes of Disk 2 (SSD), press "Apply" button to migrate C drive to SSD.

Start Migrate OS


  • The operation will be completed under the PreOS Mode, and the computer will be restart.

  • You should enter the BIOS to set the SSD drive as the first boot device when the copy is done.


With AOMEI Partition Assistant Professional, you can transfer OS and other apps saved on C drive to a new SSD without reinstallation just within a few clicks. If you want to transfer all data on the whole hard disk drive to SSD, you can use it to clone all partitions on the hard drive to SSD. In fact, it’s far more than cloning software and it allows you to recover lost partition, extend C drive without formatting, and so on.