Partition offset

diskpartpartitionmanager

After cleaning my hard disk, I created some new partitions using DiskPart, but there is a parameter called "Offset". I have read about it on internet , but there is a little information available about it, and I wasn't able to understand what it actually means and what's used for.

I created a 4th partition of size 105 GB, but it is showing an offset of 127 GB, is it okay ?

I have attached a photo of DiskPart showing offset size

Best Answer

The offset is where your new partition starts from.

How 127 GB was calculated?

Notice the offset of each partition is the sum of: the size of the precedent partition and the last offset. (The first partition starts at 1024KB = 1MB).

The first offset is 1024KB (1MB).

  • The first partition has a size of 100MB. The second partition's offset is 101MB (100MB + 1MB).

  • The second partition's size is 29GB. The offset for the 3rd partition is 29GB + 101MB which is still 29GB (29.1 GB actually)

  • The 3rd partition's size is 97GB. The next (4th) partition will have an offset of 29.1GB + 97GB = ~127GB

  • The next partition, if you decide to create a new one, will start from 127GB + 105GB = 232 GB

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