China DOS Union

I'm a new user of your forum. usbmass is really a great thing, almost driving all my USB devices completely. Now let's talk about my experience and share it with you.
1. At first, my USB 2.0 mobile hard disk couldn't be driven. Later, I found that the default interrupt number was different from the interrupt of my motherboard's USB 2.0 port. After adding the parameter /pi:xx, it was solved. The speed is very cool, but it's a little slower than that under XP.
2. Regarding the problem of driving USB flash drives. People who have used the usboot software know that there are three formatting formats for USB flash drives: FDD, ZIP, and HDD. It's a pity that the first two are not supported by usbmass. If you really want to drive a USB flash drive, you can only convert it to HDD format. My 1G CF card was driven like this, and the speed can reach 5.5M/second. But I don't recommend using USB flash drives in such a format, because if you use a USB flash drive in such a format to boot the computer, you will find that the drive letter of the USB flash drive is C instead of A.
3. You can also use the USB flash drive to boot to drive other USB devices, but it's a little troublesome. Because usbmass can't drive itself (the boot USB flash drive), it will crash. You can build a virtual disk in memory after DOS boots, copy usbmass to it, then unplug the USB flash drive and plug in other USB devices, and then it can be driven.
4. Because usbmass doesn't need to be loaded in config.sys, this is its biggest advantage. So it's best not to plug in USB devices when the machine is powered on. Wait until DOS is booted, and then plug them in when you want to use them. Otherwise, the same device will have two drive letters.
5. The NTFS - formatted mobile hard disk can be driven, but it can't be read. NTFSPRO also doesn't work. Is there any friend who has a good way? Thank you for giving advice.

Give a thumbs up... Unfortunately, I don't have a USB 2.0 device at hand, so I can't debug.

I tried according to brother's method but it didn't work.

Not bad, ZIP format is also okay. I have recognized my mobile hard drive, but not the external CD drive

Boss, I would like to ask, how to know the interrupt number of USB 2.0? Isn't it dynamically allocated? What is the xx in the parameter pi: xx?

Thanks for sharing

You can also use USB drive to drive other USB devices, but it's a bit troublesome because usbmass can't drive itself (the boot USB drive), which will cause a system crash. You can create a virtual disk in memory after DOS boots, copy usbmass to it, then unplug the USB drive and plug in other USB devices, and then you can drive them.

Please tell me how to create a virtual disk under DOS, what is the command, can you type it out. Copy usbmass into the virtual disk, don't run it, then unplug the USB drive? If you don't run it, then plug in the USB device, can it be driven?

I'm a newbie. Please give me more advice.

Let's download it first and see if it works well.

My motherboard doesn't support HDD