Mfcttrf

We have two options;

a. creating a primary partition (say D:) or

b. creating an extended partition, then create a logical partition (say D:) in the extended partition

In terms of data security, data loss or anything else, is there any difference, if we keep data in primary partition or if we keep data in logical partition?

Regards

FewL

If you are using a Logical Partition in an Extended Partition, then you are using the old-fashioned MBR Partition Tables which are limited to drives of 2TB or less. The current standard for Windows 10 is GPT Partition Tables which arrived with EFI and UEFI Booting. One poster tested and found better performance with GPT, and GPT has additional features which help protect your data better, transparantly. Microsoft has provided an article on conversion.

Therefore, storing your data on an MBR partitioned drive is less safe than a GPT partitioned drive, but Tetsujin's also very right, and I voted for his answer.

No difference whatsoever.

For data loss-prevention, your only security is to never keep only one copy of anything.

There's an adage...

"Any data not stored in at lest three distinct locations ought to be considered temporary."

In short, that means one on-site backup & one off-site backup [in case the house burns down.]

Having all your eggs in one basket... it doesn't matter if you have two baskets, if you're carrying them both in the same hand.

Assuming data is 'safe' because it's on a different partition on the same physical drive, no matter how you format it, is 'all eggs in one basket'.

When creating a second partition for data storage (i.e., not the boot partition) for an OS, the primary difference here is that it may affect your ability to create more partitions later.

There are four primary partition slots on an MBR-formatted drive. One of these may be used to create/hold an extended partition, which in turn allows additional partitions on the drive that do not use any of the remaining three primary partition slots in the MBR.

If all four primary partition slots are allocated to primary partitions, it's no longer possible to add an extended partition and thus you can add no more partitions to that drive, even if you have free space. Therefore it's standard practice, when creating the first partition for which an extended partition slot can be used, to create it as an extended partition. This ensures that further additions can never run out of partition slots.

Some older or less sophisticated boot programs may not be able to boot from an extended partition but only from a primary one, so it's also good practice not to use a primary slot for a partition you know you will never want to boot, leaving it free in case you later need another bootable partition.