How does Windows 98 determine if the previous shutdown was an improper shutdown? - China DOS Union Forum

The following is a quote from pfox on 2003-5-4 17:15:36:
So I think it should be recorded in the boot sector or somewhere on the hard disk, not in a file.

It is very possible. When I initially used SYSTEM COMMANDER, there was a timeout. After that, no matter re-partitioning or formatting, it could be detected that SC had been installed before and there was a timeout, refusing to install. Finally, I low - formatted the first few hundred sectors to be able to reinstall it. So maybe MS also uses the same means, writing data as a mark in the first few sectors of the hard disk that do not belong to any partition.

Floor16　nre	Posted 2003-05-04 00:00
银牌会员　Posts 361　Credits 1,210
*The following is a quote from pfox* on 2003-5-4 17:15:36:** So I think it should be recorded in the boot sector or somewhere on the hard disk, not in a file. It is very possible. When I initially used SYSTEM COMMANDER, there was a timeout. After that, no matter re-partitioning or formatting, it could be detected that SC had been installed before and there was a timeout, refusing to install. Finally, I low - formatted the first few hundred sectors to be able to reinstall it. So maybe MS also uses the same means, writing data as a mark in the first few sectors of the hard disk that do not belong to any partition.

Floor17　Wengier	Posted 2003-05-04 00:00
系统支持　Posts 10,521　Credits 27,736
As far as I know, Windows sets a flag in the file allocation table (FAT) of the drive, which is how it can be determined.

Floor18　红色狂想	Posted 2003-05-05 00:00
金牌会员　Posts 1,501　Credits 4,289　From 河南省
*The following is a quote from Wengier* on 2003-5-4 23:30:45:** As far as I know, Windows does a flag in the file allocation table (FAT) of the drive to be able to determine it.