How to directly read and write to the hard disk using BIOS's IO? - China DOS Union Forum

ATA Command
BIOS INT13
DOS INTXX

Never heard of BIOS IO

Reading and writing to I/O ports in QBASIC is very simple. OUT is for writing to a port. INP is for reading from a port. I don't know if the original poster knows how to use QBASIC.

Brothers, int13 and interrupts under DOS are all very simple. I just want to bypass Lenovo's protection system and how to write to a sector. I think if I directly issue instructions to the CPU, can that work? How should I do it? How to handle the ATA Command?

It's very simple. If you know a programming language, it's very simple. Do you know qbasic!
If you do, you can take a look at the post I wrote about getting the hard disk serial number. That program directly uses I/O ports.

Because the BIOS doesn't provide the service of the hard disk serial number, so you must send instructions to the hard disk's ports such as (&H170......) by yourself, and then read the serial number. Note that this serial number is not the number of each partition of the hard disk. Some netizens say that the C drive, D drive, etc. all have serial numbers. In fact, that's the volume label!

The advantage of reading and writing the hard disk through I/O instructions is: you can bypass the services provided by the BIOS, so you can break through restoration software, and you can read and write hard disks no larger than 137GB on old 486 computers!
Of course, the more important use is not here. There are many hard disk-specific commands that must be implemented through I/O instructions, such as writing negative tracks, adding bad sectors to the G table, etc.
All powerful hard disk repair software use I/O instructions, such as the PC3000 and MHDD that we are familiar with.

It is recommended that you learn a programming language. C language is the best choice! Although I don't know C language, I only know qbasic!

To be honest, C language is acceptable. Or directly using assembly can also be done roughly.
I'll first look for your post. Thanks qb45.
By the way, is the qb moderator in programfan you? The names are the same.

qb45: I can't find your post. I saw your post about the restore card before, but it's okay without the restore card, but it doesn't work after installing it. What should I do?

Why not name it QB71? Isn't there a version 7.1?

If only writing the hard disk hidden sector, HDSECT is enough (it's in the Super Emergency Disk)

Floor2　darkradx	Posted 2006-03-13 23:01
高级用户　Posts 420　Credits 972
ATA Command BIOS INT13 DOS INTXX Never heard of BIOS IO

Floor3　qb45	Posted 2006-03-14 12:19
高级用户　Posts 194　Credits 677
Reading and writing to I/O ports in QBASIC is very simple. OUT is for writing to a port. INP is for reading from a port. I don't know if the original poster knows how to use QBASIC.

Floor4　zhgwbzhd	Posted 2006-03-22 11:56
高级用户　Posts 187　Credits 506
Brothers, int13 and interrupts under DOS are all very simple. I just want to bypass Lenovo's protection system and how to write to a sector. I think if I directly issue instructions to the CPU, can that work? How should I do it? How to handle the ATA Command?

Floor5　qb45	Posted 2006-03-22 13:31
高级用户　Posts 194　Credits 677
It's very simple. If you know a programming language, it's very simple. Do you know qbasic! If you do, you can take a look at the post I wrote about getting the hard disk serial number. That program directly uses I/O ports. Because the BIOS doesn't provide the service of the hard disk serial number, so you must send instructions to the hard disk's ports such as (&H170......) by yourself, and then read the serial number. Note that this serial number is not the number of each partition of the hard disk. Some netizens say that the C drive, D drive, etc. all have serial numbers. In fact, that's the volume label! The advantage of reading and writing the hard disk through I/O instructions is: you can bypass the services provided by the BIOS, so you can break through restoration software, and you can read and write hard disks no larger than 137GB on old 486 computers! Of course, the more important use is not here. There are many hard disk-specific commands that must be implemented through I/O instructions, such as writing negative tracks, adding bad sectors to the G table, etc. All powerful hard disk repair software use I/O instructions, such as the PC3000 and MHDD that we are familiar with. It is recommended that you learn a programming language. C language is the best choice! Although I don't know C language, I only know qbasic!

Floor6　zhgwbzhd	Posted 2006-03-22 14:48
高级用户　Posts 187　Credits 506
To be honest, C language is acceptable. Or directly using assembly can also be done roughly. I'll first look for your post. Thanks qb45. By the way, is the qb moderator in programfan you? The names are the same.

Floor1　zhgwbzhd	Posted 2006-03-13 21:27
高级用户　Posts 187　Credits 506

Floor7　zhgwbzhd	Posted 2006-03-22 15:35
高级用户　Posts 187　Credits 506
qb45: I can't find your post. I saw your post about the restore card before, but it's okay without the restore card, but it doesn't work after installing it. What should I do?

Floor8　zjnbwdj	Posted 2006-03-23 11:58
中级用户　Posts 137　Credits 300
Why not name it QB71? Isn't there a version 7.1?

Floor9　gmy	Posted 2006-03-27 15:59
版主　Posts 392　Credits 1,113
If only writing the hard disk hidden sector, HDSECT is enough (it's in the Super Emergency Disk)