x86 BIOS Interrupt 13,2
According to the image, the DL register has to contain a specific value in order to know what drive number to read from, however, in the following code (using intel syntax), we are instead moving the dl register into the value of the ebr_drive_number (that we defined above), instead of the other way around. How then is it able to function correctly, as I am able to read data from the disk.

ebr_drive_number: DB 0

; other code

main:
    MOV ax,0
    MOV ds,ax ;start address of data segment
    MOV es,ax ;start address of extended segment
    mov ss,ax ;start address of stack segments

    MOV sp,0x7C00
    
    MOV [ebr_drive_number],dl ;Drive number to read from <------------- HERE
    MOV ax, 1 ;LBA Index
    MOV cl, 1 ; sector number
    MOV bx, 0x7E00 ;pointer to a buffer
    CALL disk_read

    MOV si,os_boot_msg
    CALL print
    HLT 

when switching the order of the operation,

MOV dl,[ebr_drive_number}

which makes more sense in my head, as we are moving the value that we defined as ebr_drive_number into the dl register, which the interrupt needs, no data is read from the disk, but no build errors are present either.