USBD vs USBM

**derkesthai** · 03-29-2009,10:20 AM

Maybe this is not really SMS related, but I'm trying to get SMS to do what I want so..

What's the difference between USBD.IRX and USBM.IRX? It seems they are interchangable? When would you have to different ones?

I've searched quite a bit, but I haven't been able to find a good answer

Anyone care to give some insight on this?

**dlanor** · 03-30-2009,07:29 AM

Originally Posted by derkesthai

Maybe this is not really SMS related, but I'm trying to get SMS to do what I want so..

What's the difference between USBD.IRX and USBM.IRX? It seems they are interchangable? When would you have to different ones?

I've searched quite a bit, but I haven't been able to find a good answer

Anyone care to give some insight on this?

USBD.IRX == Mainly a low level USB device driver, which doesn't really care about the types of devices used, except for USB hubs, which it also includes the 'high-level' driver for. The purpose of the low-level driver is to provide basic USB access functions to be used by the high-level drivers.

USBM.IRX == Mass storage device driver. This implements the standard PS2 storage device file operations for a USB mass storage device. (The "mass:" drives in the generic PS2 filesystem) This corresponds to the USBHDFSD.IRX used by uLaunchELF and FMCB, except that EEUG codes his own drivers that differ from the standard ps2dev ones in some respects.

eg: EEUG was first to implement multiple USB drive support, but he still has not implemented multiple partition support, while the standard driver now includes both those features. (Doesn't really matter much, as we never need multiple partitions with the PS2.)

Best regards: dlanor

**jm71** · 03-30-2009,08:43 PM

>dlanor

Excellent!, thanks for the data,

**derkesthai** · 04-11-2009,12:53 PM

Thanks, excellent information

so what are the best drivers to use? like.. best performance vs. best compatibility

**dlanor** · 04-11-2009,02:20 PM

Originally Posted by derkesthai

Thanks, excellent information

so what are the best drivers to use? like.. best performance vs. best compatibility

The best drivers available for generic homebrew use are those developed at ps2dev.org and most recently improved by radad (with some slight assistance by me

). Those drivers are available in the release post of uLaunchELF, here at psx-scene.

Btw: radad of ps2dev.org is registered here at psx-scene as radad1

But the best drivers to use for SMS are normally the ones made by EEUG for that purpose. No question about it, those are the most compatible to the program, as they were designed for it. But if they fail to be compatible to some USB device you have, then it may be better to try other drivers even for SMS.

Best regards: dlanor

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