Question about int 13h

[matias_beretta]

Hello, thanks for reading my topic. Should I reset the disk before reading sectors?

[Dex]

From my understanding (if your talking in Dos) you only need to reset the disk, if a preceding disk operation has reported a error.

[Red Shaya]

A general pseudo code for a read function will look like

Code: Select all

    nRetries = 5
tryRead:
    try to read sectors
    if OK then JMP :end
    reset disk
    nRetries -= 1
    if nRetries > 0 then JMP :tryRead
end:
    RET

Try to look at code samples for a read function using INT 13 to get a better grip of the idea.

[jerryleecooper]

What happens if you reset the disk if no error was reported?

[Dex]

You get a hard reset, that is the next time the drive is accessed, it first resets to cylinder 0 .