Mc and Windows

I want to use my wd external drive to windows laptop and mac laptop at the same time… how can i do something like this??

In order to use it on both OS’s you can format the hard drive using FAT32 or exFAT. Click on the following link for the steps.

How to format a WD external hard drive in exFAT or FAT32 (to use in Windows or Mac OSX) 

The downside of FAT32 is the max file size is 4 gig. There is also software available to use the drive on both when formatted for Mac or Windows but I think they are all now pay.