
Sometimes, it may happen that your FAT32 is greyed out in Mac Disk Utility because it isn’t mounted. So, let’s proceed… How To Fix USB Flash Or External Hard Drives Greyed Out In Disk Utility? This article contains complete information regarding how to solve the FAT 32 greyed-out Mac problem in a hassle-free manner. How to fix FAT32 greyed out on Mac disk utility? How to format the FAT32 on Mac OS? If you’re the one who also facing the same issue & wants to know how to deal with FAT32 greyed-out issue, then don’t panic.

The only hardware changed has bee the HDD.There are several users interested to know why the FAT32 greyed out Mac while formatting the USB flash drive or hard disk in the Mac. I have not touched the BIOS since taking ownership of the PC as new a little over 2 years ago - is it possible for it to change itself? I disconnected the drive and booted normally, came online and wrote this. I shut it down and changed the SATA port it was connected to on the motherboard and tried again - same result. I did copy some files across with no problems and all seemed fine. Perhaps I should have re-booted after the format but I didn`t. The options were not greyed out at this point.

I formatted the new drive fully - all appeared well.

I fitted a brand new drive, the PC booted normally and the drive was not recognised in `My Computer. BUT, if I have a second drive fitted I have a boot problem in as much as the PC wont boot but just sits with a lot of drive activity after the `loading` screen and before the `Welcome` screen. Using Acronis TI I cloned my primary drive to the suspect drive - it boots and runs OK. No I haven`t tried MaxBlast but doesn`t the new SeaTools do the same job? Sorry I have no idea how to post a screenshot of Disk Management.
