Will such a distribution of files by its id work?

Question

PHP

Good afternoon. This is no longer a question, but so, to consult.
For some time I was thinking about the distribution of files by their id, and settled on this option:
1. Convert id from decimal to hexadecimal. The ID must be greater than or equal to 4096 for the resulting hexadecimal number to be greater than or equal to 4 in length.
2. The store consists of levels. Each level has 256 folders. As a result, 256^2 = 65536 folders. If we take a thousand files as the maximum optimal number of files in a folder, then in the end we have a storage for 65536000 files (1000 in each folder). For the name of the folder of the first level, "cut off" the last 2 digits of id, for the second level, 2 more last digits. In this way we will achieve an even distribution. Here is an example of a path definition:

$dir = substr($hex, -2, 2) . '/' . substr($hex, -4, 2);

3. For the file name, we use its id and if you need to protect it from brute force for downloading, then add an arbitrary string to it (for example, a hash sum, the crc32 algorithm will be enough) and you can’t get the file simply by id.
Example: /e5/f5/83f5e5-r45c943k.jpg
Having done tests, with 10 million files, there were 152-153 files in each folder.
How do you like the option? Are there stones? Crooked? Thanks in advance!

Answer 1

I would stage
replaced the hash from id or some other value with MD5.
That would decide
and
And so, as for me, it seems normal

Answer 2

Norm, though for generating id I would take the usual uuid v4. Look also towards solutions like mogilefs, you may not need your bike