Ext HD Installs But Cant See It.

@rybosix,

I have some basic doubts now. Its a guessing game for me.

Is Disk 1 your 250GB external drive? The drive it shows seems to be a internal system drive that was UEFI (GPT)

You have to give us a complete history as to where it came from, what OS that system was using, how you made that internal drive into an external drive, What is the OS in the system on which you have taken the screenshot etc.,

You must also tell why that drive was removed from the original system and what exactly you want to do from the drive so removed.

I mean the complete history from A to Z.

Juman, this ext. HD came to me used. I formatted on my old Toshibal W7 PC and used Macrium to attempt backup.

Then I used it on my mac as backup and could boot from etc.....

I got new ext. HD for my mac so I finally got around to trying to use it on this new used PC I have.

Again, in task bar ^ it shows little icon and allows me to eject Ext HD oropen in devices. Opening in devices does do much. Allows me to see properities but nothing there allows me find a format option.

So I sent you image of disk manager, and yes the ext HD to best of my knowledge has always been and ext. HD. It shows on disk manager as 'disk 1' just as bert stated. But the in the list at top of idsk manager you can see it has no name.

I think I had it in 3 partitiions---1 was bootable clone of mac, other was backup clone and 3rd was for some movies.

What should happen is a window on desk top should notify me of this ext HD, instean all that I got was installing software drivers completed successfully.

But there is no icon for the Ext HD anywhere except in ^ in task bar mentioned above, and in disk manager that leads to no format options, and devices and only leads to properties.

Maybe if I hoook it back onto mac and delete filess. Maybe the mac will allow me to format as FAt whatever.

rsix

jumanji said:

@rybosix,

I have some basic doubts now. Its a guessing game for me.

Is Disk 1 your 250GB external drive? The drive it shows seems to be a internal system drive that was UEFI (GPT)

You have to give us a complete history as to where it came from, what OS that system was using, how you made that internal drive into an external drive, What is the OS in the system on which you have taken the screenshot etc.,

You must also tell why that drive was removed from the original system and what exactly you want to do from the drive so removed.

I mean the complete history from A to Z.

I still cannot quite make out how your external drive shows a 200MB EFI System partition.I am Mac-unaware.:) Windows 7 may not recognize a bootable EFI external drive I presume.Since you had cloned your mac drive this is what happened , I presume again.

OK, try it again on your Mac and if need be copy all the files to another location..

Then we shall try to write zeros to all sectors and format it as an MBR drive on your Windows 7 machine. Is that OK for you?

Hi Juman, maybe EFI is electronic fuel Injection ;--)

I do not need to save any files on the HD--- its western digital ---. I have to wait now til my wife finnishes her beauty sleep. Then I will delete files and see if the mac offers a FAT fromatting option.

To be clear, on the PC I can see the format option when I right-click in disk manager, but it is grayed out so not available. Not sure if that helps or tells you anything of significances.

Again this is strangest thing that I haver encountered with et HD, as it is seen just no acccessable to format or anything except to eject or make dyamnic or a few other options in disk managger.

Thx again, rsix

jumanji said:

I still cannot quite make out how your external drive shows a 200MB EFI System partition.I am Mac-unaware.:) Windows 7 may not recognize a bootable EFI external drive I presume.Since you had cloned your mac drive this is what happened , I presume again.

OK, try it again on your Mac and if need be copy all the files to another location..

Then we shall try to write zeros to all sectors and format it as an MBR drive on your Windows 7 machine. Is that OK for you?

I this URL that gives commands on how to delete the EFI formating

How to Convert a Mac-Formatted Drive to a Windows Drive

r6

goto registry and remove the lower limt and upper limit

Ha, that link was the ticket. Thx to Bert, Juman and others. Now I get typical window to show files on my new data file/volume F; YAY!

rsix

rybosix said:

I this URL that gives commands on how to delete the EFI formating

How to Convert a Mac-Formatted Drive to a Windows Drive

r6

Yep, that was it. You used Diskpart Clean command to effectively zero the first 2048 sectors wiping the bootable EFI system partition. I would have preferred a cleanall command to zero all sectors, so that you start with an an entirely clean slate. That was what I meant by zeroing all sectors.

Glad you resolved your problem. Good going.

Yeah, worked and refroomatted in lest than a 2nd. I didn't see option to zero out vectors but I know, that, on my mac, there are 3 versions of passes--- 1 pas, 3, passes, 7 passes --- to do best job zeroing out but I always have chosen the fastest cleaning method.

Ive inloaded Macrium, to I briefly consider Todus Easus.

Getting ready to clone. Yay!

jumanji said:

Yep, that was it. You used Diskpart Clean command to effectively zero the first 2048 sectors wiping the bootable EFI system partition. I would have preferred a cleanall command to zero all sectors, so that you start with an an entirely clean slate. That was what I meant by zeroing all sectors.

Glad you resolved your problem. Good going.