Lately, updated, from 10.5.5 to 10.5.7. in that I had used Combo update, downloaded frankly from Apple. Initially , backed up to a Firewire, Western Digital Bootable Ext. High Definition , through Super Duper, then ejected the HD. Everything was going fine,all of a sudden the WD ext. HD did not turn up on the desktop but strangely did emerge in Disk Utility Window , so when I clicked on Info for the ext HD, it displayed the connection ID #, and all specifications, showed as Bootable, & writable, as well , please help me out .