I am new for oracle- please help.
env.- Oracle 8.0.5- archive mode.

Last week we had experienced space issue and we added 1 disk (say diskdrive-M) and then allocated 2 datafiles, one for indx tablespace and another for Data tablespace.

Disk-M is not as powful as the other disks on the server. Now I need to remove this slow disk and replace a new, powerful disks (same as the others on the server). Any suggestion for how to get this done?