I recently bought a 5 TB USB3 hard disk to back up my data (mostly my photo and video files. I had a data disaster recently, so I bought the EaseUS disaster backup data recovery tool, but it required a huge amount of data to restore).
Out of the box, without paying attention to the factory default format it has (extFAT), the 5 TB space has only about 0.6 TB space left. I doubt I had that much-used data (as the source of the recovered data is from a 1 TB hard drive). After doing some investigation (the detail is down below), I found out that the allocation unit size (AUS) of the removable hard disk is pretty big, I think it is too big to storage average files. So I am in the process of backing up the data to my other hard drive (NTFS, 4k AUS), before I can reformat the drive to have a smaller AUS.
Meanwhile, I am not decided whether to stick with extFAT or change it to NTFS. I don't really care about portability to other OSes, especially Apple products (sorry MacOS!), as I am pretty much a Windows (plus Linux) user. Yes, I am all aware that so far Linux supports R/W to NTFS in userspace only (the kernel driver only supports read and some limited write access, but that requires some enabling). But, the good news is that, according to the recent news, a company called Paragon is willing to make its full-blown proprietary NTFS driver (which fully supports NTFS features) to the Linux community. The effort is planned to be available starting in Kernel 5.15. This will really boost the performance and features of NTFS in Linux.[1]
To have 256K AUS seems too expensive. According to [3] for Test 3 and 4 (Read & Write, 1 GB of data file), extFAT is slightly faster, but for smaller files (Test 1 and 2, 1 GB file size), NTFS prevails. For duplication or deletion (Test 8 and 9), NTFS is more than 1.60 faster than FAT32 and 1.3 faster than extFAT).
Some useful information:
For 2 TB to 16 TB hard drive, 4 KB AUS is enough for an NTFS-formatted hard drive.[2]
Disk Partition Information:
C:\Windows\System32>diskpart
Copyright (C) Microsoft Corporation.
On computer: ASUS-ROGSTRIX-X
Ref:
[1] Linux boosts Microsoft NTFS support as Linus Torvalds complains about GitHub merges | ZDNet
[2] Default cluster size for NTFS, FAT, and exFAT (microsoft.com)
[3] Flexense - Data Management Software - FAT32 vs. exFAT vs. NTFS USB3 Performance Comparison