Where is my space? Note the exfat format setting traps

A few days ago, I bought a 64 GB microSD card and added a 3-way card reader. I inserted it into the sad air to expand the disk.

OK, the card is ready, so I formatted it. The card larger than 32 GB cannot format the fat program, and NTFS is very large for card reading and writing, so I formatted it as exfat:

Then I copied the materials over 20 GB and copied them for over 8 hours... Run the computer one night and copy it... T_t

The next day, suddenly found... Nana, the disk is almost full 0_0:

Nana !!!!!? What about my space ??? I really copied more than 20 GB of data ....

Have you hit a gun and bought a commodity? No. I copied 10 4g iso files after I bought them. The card should be correct.

So where is the space? With patience, we circled all the files on the card, right-click the attribute, and waited for 10 minutes to come up with a result:

Oh, I purchased 20 GB of cake materials and actually occupied 50 GB of space. How can this space be occupied? The occupied space is generally larger than the file size. I understand this, but this is too outrageous. The occupied space is much larger than the actual size, which is more than doubled... Think twice about it .... Next, look for several files and check the attributes:

See it? The smallest file occupies 128 kb space, and the others are multiples... 128kb .. KB... KB... That is to say .... ..... .... The minimum cluster size is KB ???.... Nima win7 has such a trap, the default cluster is actually kb... T_t I trust you so much

Find the reason, OK, then let's go back to the beginning, reformat the extfat, and change the allocation unit size to 4096 bytes:

In addition, check the default NTFS cluster size, which is 4096 bytes:

 

... T_t, reformat it at night. Wait for another 8 hours. The case is closed.

 

PS. hdclone has never been used. I used it to copy data. It took about one hour to get it right, but the SD card could not be read and changed to raw format.