In Zoom devices, effects and other files (drum samples for drum machines, icons, and impulses) are stored in a separate part of the flash memory (FS), formatted with a FAT-like file system.

Files are written page by page, with one page being 4096 bytes in size, including 6 bytes for service information (the address of the previous page, the address of the next page, and the size of the data within the page).
Therefore, the data size is calculated in pages of 4090 bytes.

To calculate the file size in pages, divide the file size in bytes by the page size, rounding up.

For example:

COMP-1.40.ZD2
13390 bytes
13390 / 4090 = 3,273 - file size 4 pagess

COMP-1.40_SH.ZD2
11347 bytes
11347 / 4090 = 2,77 - file size 3 pages

This means that files 8200 bytes (8200/4090 = 2,004) и 12270 bytes (12270/4090 = 3) take up 3 pages.

Calculating file sizes, free and used space in bytes is not representative, all sizes will be reported in pages