This page tells methods to change cluster size from 4k to 64k for hdd or ssd without data loss or without formatting.
Cluster size is a single unit in a building that stored data. The smaller size of a single space, the more efficiency of the space used. Otherwise, the larger a single size, the less time it may use for storing a large file. For example, if you set your disk cluster size to 64k, it would take less time to make a transfer of a large video or movie file, 1GB for instance.
This part includes several ways to make changes on block size from 4k to 64k even you do not want to format the disk or lose data.
File explorer is provided by Windows, namely right click format option in Windows computers. This can be done with simple clicks (It involves a formatting)
Note: Please backup data to somewhere else before the formatting. We strongly recommend you use another large disk as backup storage media to store important files since formatting would erase everything on the disk drive where you want to change its block size. (You may simply insert the backup disk to the pc and then copy and paste all data to the backup disk)
Better Solution: free software IM-Magic Partition Resizer to change block size for free.
IM-Magic Partition Resizer is completely free of charge on Windows pcs that you may change the cluster size from 4k to other sizes such as 64k. It also has a portable version that even does not require a installation to do the job.
Here are the steps to change cluster size with Partition Resizer.
Format partition to change cluster size
What's more? This free tool can repair bad blocks, change disk from gpt to mbr, mbr to gpt, dynamic to basic disk, change disk drive size without losing data etc.
Partition Wizard is the tool that can change a dynamic disk fat32 system from 4k to 64k without formatting or losing data. This tool provides free edition together with paid edition(bootable, winpe). Here are the steps to make the change.
Note: It may include a fee to do the 4k to 64k conversion. If you do not want to pay to do the conversion, you may use the free methods.
Before doing the following conversion, please do backup data onthe disk to another hard drive or external hard drive as data backup that you may freely change the cluster size.
Disk Management provided by Windows is able to do the job with its format drive option. Here are the steps.
This can be done with disk management too when you delete all disk, and then create a volume and then set its cluster size to be 64K in the new volume wizard.
See the following image that displays the option.
Note: If the local disk manager said: The format option did not complete because the cluster count is higher than expected, you need to choose a less k. Here is a table that is for the disk size and cluster size for consideration.
7 MB - 512 MB
|NTFS Cluser Size|
|513 MB - 1,024 MB||1 KB|
|1,025 MB - 2 GB||2 KB|
|2 GB - 2 TB||4 KB|
|2 TB - 4 TB||8 KB|
|4 TB - 8 TB||16 KB|
|8 TB - 16 TB||32 KB|
|16 TB - 32 TB||64 KB|
Q: Can I set a 4TB disk 64kb?
A: According to the above table, 64kb cluster size is suitable for a disk with storage size from 16tb to 32tb. The 64k might not be the option for a 4tb disk as a best option.
Q: Can I format a disk from 4k to 64k without losing data?
A: There is no way to format a disk 4k to 64k with data untouched, usually all data will be removed during the conversion. So we strongly recommend you backup data at first.