If you want to transfer files from a Mac to Windows PC and vice versa using an external portable hard drive then you have to have the external drive formatted in a file system both OS's can read and write too. Your choice is ms-dos (aka fat32) or exfat and I go over the difference in the video. Note: most external drives you buy will automatically be formatted in NTFS which is a Windows file system. Macs can only read but not write to a ntfs file system. So if you want your external hard drive to be backward compatible with both OS's then you need to reformat it with fat32 or exfat.

Personal Storage 3100 Win98SE Driver Quick Start Guide. This is a special patch for the users of the Personal Storage 5000 external hard drive with the USB connection in Windows Me. This download contains the WinXP Drivers for the Personal Storage 5000 external hard drive.

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How to format your external drive for Mac You'll need to start with a clean thumb drive or hard drive in order to get it ready to work as a bootable drive. • Plug the USB end of the drive to a USB port on your Mac.

• Click on Finder in your Dock to open a Finder window. • Select Applications from the list on the left side of the window. • Scroll down and double-click on Utilities. • Scroll down and double-click on Disk Utility. • Select your drive under External.

• Click on the Erase tab at the top of the window. • Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external hard drive named 'Untitled,' you will need to rename your hard drive now. • If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list.

If your Mac is using APFS, select APFS from the format list. • If Scheme is available, select GUID Partition Map.

• Click Erase. • Click Done when the process is complete. • Close the Disk Utility window. Your thumb drive or external hard drive is now ready. How to make your external drive bootable for installing macOS High Sierra Important:You will need to be in your Mac's administrator account in order to run the sudo Terminal command.

• Click on Finder in your Dock to open a Finder window. • Select Applications from the list on the left side of the window. • Scroll down and double-click on Utilities. • Scroll down and double click on Terminal. • Recall the name of your when entering the following text into Terminal. If it is not named 'Untitled,' you will need to change the command syntax for the pathname where it says: Volumes/Untitled.

The name of the drive can't have any spaces and it is case sensitive. • Enter the following text into Terminal ( Don't forget to change the name 'Untitled' if your hard drive is named something else): sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS High Sierra.app • Hit the enter/return key. • Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password. The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.'

How to use macOS High Sierra with an installer boot drive Once macOS High Sierra is installed on your external drive, you can boot up and install any Mac with the drive plugged into it. • Turn off the Mac you want to install macOS High Sierra with the bootable drive. • Connect the external drive to your Mac via the USB port. • Turn on your Mac. • Hold down the Option key when you hear the startup chime.