I have two drives. One is a 1TB MY PASSPORT drive, and the other is a 4TB ELEMENTS drive (recently bought the latter).
For some reason, I just can’t fit the data from the 1TB into an empty 4TB drive. Both are formatted as EXTFS, with the same cluster size.
At first I thought it is because the 4TB wastes more space due to cluster size or something of that sort (and having too many files), but that’s not the case. Even when I zip the 10 main directories at the root of the 1TB files into ten files in the 4TB drive, the space still doesn’t match. The files, unrolled, in their full glory, take all space on the 1TB drive, but they take at least 2.2TB on the 4TB drive (it is still zipping, hasn’t finished yet), and I expect there won’t be enough space.
Please note that I start with 3.6TB on the 4TB after formatting it, and that it is completely empty when I start the process.
This is all very strange to me, it seems like the 4TB drive doesn’t really have 4TB on it!
Here is some info:
$ df -h
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk4s1 931Gi 931Gi 12Mi 100% 0 0 100% /Volumes/MY PASSPORT
/dev/disk3 3.6Ti 2.2Ti 1.4Ti 61% 148909008 95216112 61% /Volumes/Elements
4 TB information: $ sudo newfs_exfat -N /dev/disk3 Reformatting existing ExFAT volume Partition offset : 0 sectors (0 bytes) Volume size : 7813969920 sectors (4000752599040 bytes) Bytes per sector : 512 Bytes per cluster: 16384 FAT offset : 32768 sectors (16777216 bytes) # FAT sectors : 1933312 Number of FATs : 1 Cluster offset : 1966080 sectors (1006632960 bytes) # Clusters : 244125120 Volume Serial # : 5d2afd28 Bitmap start : 2 Bitmap file size : 30515640 Upcase start : 1865 Upcase file size : 5836 Root start : 1866
Here is the information from the 1TB drive:
$ sudo newfs_exfat -N /dev/disk4 Partition offset : 0 sectors (0 bytes) Volume size : 1953458176 sectors (1000170586112 bytes) Bytes per sector : 512 Bytes per cluster: 131072 FAT offset : 2048 sectors (1048576 bytes) # FAT sectors : 61440 Number of FATs : 1 Cluster offset : 63488 sectors (32505856 bytes) # Clusters : 7630448 Volume Serial # : 5d406cb7 Bitmap start : 2 Bitmap file size : 953806 Upcase start : 10 Upcase file size : 5836 Root start : 11