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Enhanced mode in NT?

Enhanced mode was necessary because DOS did not have the power to access the additional memory Windows needed to run. Windows (from Win3.11to Win98) ran as just another program in DOS, albeit a very powerful program. Fortunately, in the more powerful and later versions of the OS (Windows NT/2000/XP), DOS has been eliminated from the core of the system. As such, Enhanced Mode is no longer applicable for computers using these OSes

NT's Memory Manager defines a 32-bit virtual address map that spans 2GB to 4GB.The space is split between user-mode application code and data and kernel-mode code and data. Usually, NT assigns the low 2GB (i.e., 0GB to 2GB) of the virtual address space to the user mode; this space is called the user space. NT assigns the upper 2GB (i.e., 2GB to 4GB) of the virtual address space to the kernel mode; this space is called the kernel space. NT does not give applications direct access to the kernel-mode portion of the address space; some versions of NT (e.g., NT Server 4.0, Enterprise Edition) support a switch that changes the virtual address space division to 3GB for the user space and 1GB for the kernel space. The kernel space permanently maps the NT kernel and device drivers, but user-space mapping changes to reflect the process address map of the currently executing thread. For example, if a Microsoft Word thread executes, Word's code and data map into the user space. However, if the scheduler switches to a Lotus Notes thread, the NT Memory Manager updates the user space with Lotus Notes' code and data.

顺便把硬盘管理再说明一下

[B][COLOR=blue]NTFS[/COLOR][/B] Windows NT/2000/XP/2003系列Native文件系统
Recommended minimum volume size is approximately 10 MB. Recommended practical maximum for volumes is 2 TB (terabytes). Much larger sizes are possible.Cannot be used on floppy disks.

File size limited only by size of volume

[B][COLOR=blue]FAT[/COLOR][/B]早期DOS系统,现在大多数数码相机，USB移动盘都使用FAT
Volumes from floppy disk size up to 4 GB. Does not support domains.

Maximum file size 2 GB. 

[B][COLOR=blue]FAT32[/COLOR][/B]Windos 9.x系列
Volumes from 512 MB to 2 TB. In Windows 2000, you can format a FAT32 volume only up to 32 GB.Does not support domains.

Maximum file size 4 GB.

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相关回复上下关系8
- - 😠开始狂拍砖老兵帅客字0 2004-06-11 04:12:36
  - 这个问题说起来挺复杂。我就长话短说把。 1 Highway 字1321 2004-06-10 21:28:44
    🙂评论老兵帅客字1017 2004-06-11 16:29:21
    😮Enhanced mode in NT?
    回复老兵帅客字286 2004-06-12 05:17:16
    简单地说WNT就是改进了的VMS，并无太多革命之处沐桩子字65 2004-06-10 22:09:12
    我倒觉得NT和Unix的距离要比和VMS要近一些老兵帅客字36 2004-06-11 16:30:54
    😁这没错。NT的设计师就是VMS的设计师。是微软从DEC挖来的。 Highway 字257 2004-06-10 22:23:00

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