hard disk region optimized for program start. However, as with previous versions, the repetitively aggravating "Drive contents changed....restarting." message still exists in this version (i.e. if the contents of the hard drive had changed, then the drive is then rescanned and the progress restarted where it left off). If it gets stuck on the same area too many times, it will ask the user if it should keep trying or give up. The Windows Me version of Disk Defragmenter does not have this problem and will function on Windows 98 if the user simply copies it over. Windows 98 also supports a Fast Shutdown feature that initiates shutdown without uninitializing device drivers. However, this can cause Windows 98 to hang instead of shutting down the computer if a buggy driver is active, so Microsoft supplied instructions for disabling the feature. Windows 98 supports write-behind caching for removable disk drives. A utility for converting FAT16 partitions to FAT32 without formatting the partition is also included. Other system tools A number of improvements are made to various other system tools and accessories in Windows 98. Microsoft Backup supports differential backup and SCSI tape devices in Windows 98. Disk Cleanup, a new tool, enables users to clear their disks of unnecessary files. Cleanup locations are extensible through Disk Cleanup handlers. Disk Cleanup can be automated for regular silent cleanups. Scanreg (DOS) and ScanRegW are Registry Checker tools used to back up, restore or optimize the Windows registry. ScanRegW tests the registry's integrity and saves a backup copy each time Windows successfully boots. The maximum number of copies could be customized by the user through "scanreg.ini" file. The restoration of a registry that causes Windows to fail to boot can only be done from DOS mode using ScanReg. System Configuration Utility is a new system utility used to disable programs and services that are not required to run the computer. A Maintenance Wizard is included that schedules and automates ScanDisk, Disk Defragmenter and Disk Cleanup. Windows Script Host, with VBScript and JScript engines is built-in and upgradeable to version 5.6. System File Checker checks installed versions of system files to ensure they were the same version as the one installed with Windows 98 or newer. Corrupt or older versions are replaced by the correct versions. This tool was introduced to resolve the DLL hell issue and was replaced in Windows Me by System File