mac not detected external hard drive time machine

Refuse to pay for anything that I consider to be intrisically necessary to use of product. Wondering if Snow Leopard/Disk Utility has any improvements on this score. Press Command+Space, type Disk Utility, and press Enter to open it. Takes a great deal of time and some things need fixing after completion. You’ll need to use the Disk Utility built into your Mac to work with partitions. I have not figured out how to get Leopard restored short of format, then complete (re)install with Time Machine restore kicking in at the end of that process. BKF but think it requires an OS - unlike Vista + Windows 7 where the install Disk will retore from External in ~30 minutes. BKF string of the hard drive, runs maybe a little slower than Vista & Windows 7 Backup/Restore Maint. Also available from Microsoft if no install CD. On Windows side, is Vista, W7 (32 &64Bit) and recently my daughter's HP Laptop XP which posed a problem until I found that NtBackup.Msi was in VALUEADD folder on the Windows XP install CD.

Click 'Erase' from the Disk Utility options. Open Applications > Utilities > Disk Utility Find your external hard drive in the list of drives.

Setup on my Acomdata 7200rpm External is Mac 150GB HFS, Windows 150GB NTFS. Since most external hard drives are formatted for PCs, before the backup of your Mac begins you need to format the hard drive for macOS. If you're going to use the drive on both platforms, does it need to be set up first on the PC, allocating 1/2? to Windows NTFS format, then disable/reset/delete Time Machine backups doing the Mac HFS format thing on remainder of External?

Mac not detected external hard drive time machine