Operationally there is no need to bland a hard disk when a new partition is created or a new operating system installed.

When you delete the partition table of a hard disk its 64 bytes in the 512-byte MBR will be blanked but none of the internal data is touched. Thus deletion and creation of the partition table is a reversible process if you keep a record of it.

If you create a partition the OS will not be able to use it until you format it. Once formatted there is a filing index created at the front end resulting the old data nearly impossible to piece together. When you write on it the binary bits are then changed for the areas occupied by the file. Every operating system does it this way.

By blanking the disk you gain nothing except for security reason for passing a used disk to another user. Users who have sensitive data will also like to blank the disk, say for financial data, when change its use. Forensically people with special equipment can still recover the original data even after you have blanked the disk. I just never have had a need to blank a hard disk.