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中国DOS联盟论坛 » DOS启动盘 & LOGO技术（启动盘室） » How can a program detect whether the floppy drive or USB flash drive is not installed? View 538　Replies 2

Original Poster Posted 2003-12-21 00:00　·　中国广东深圳南山区电信

szxxbb

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Problem:
USBASPI.SYS and DI1000DD.SYS have already been loaded in CONFIG.SYS.
I can read and write the USB flash drive now. But after unplugging the USB flash drive and plugging it back in, I can no longer read or write it. DOS
will say it can't find the drive, "Rrtry /Aboart /Fail", and I have to press "A" to exit.
How should an application determine this so it won't hang?

Floor 2 Posted 2003-12-21 00:00　·　美国

Wengier

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You can also use tools like DREADY (it's included in that super boot disk) to check it.

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Floor 3 Posted 2003-12-21 00:00　·　中国广东深圳南山区电信

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Many thanks to Wengier

DREADY can detect it now

But if I want to add it into my application for automatic detection, could you explain the principle?

Using DEBUG to look at DREADY.COM, it seems to use INT21 function 2F

AX=2524i
int 21
ax=352f
int 21
save ES:BX
ax=252f
int 21
..
dx=参数
ax=252f
int 21
reutnr al

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