Recovering a NTFS partition corrupted by Mac

How to use TestDisk to recover lost partition
Post Reply
Message
Author
mcfchan
Posts: 3
Joined: 02 Jun 2016, 09:01

Recovering a NTFS partition corrupted by Mac

#1 Post by mcfchan » 02 Jun 2016, 10:46

A partition of my drive becomes unreadable. My PC is configured to dual boot Mac OS El Capitan and Windows 10. So there is a drive having Win10 UEFI installed. I tried to set the Mac Time Machine drive to be the partition/drive of Win10. Time Machine prompted me the partition does not have enough space to do be a Time Machine drive. So I quite setting up the Time Machine drive. Then the Win 10 partition in NTFS becomes unreadable. The partition cannot be accessed in Mac. When I tried to boot Win10, it failed to start. I then install a Win 7 in another drive and find that the Win10 partition cannot be accessed. It looks the Time Machine in Mac has corrupted this NTFS partition.

In TestDrice, I chosen the drive having issue and select type as GPT as it is detected( wonder should choose Intel type instead?)
After Analyse, it shows:
Warning: the current number of heads per cylinder is 255
but the correct value may be 128.
You can use the Geometry menu to change this value.


Shall I change the value to 128 and if this can be changed back to 255 afterwards?

Merci!

Sponsored links

User avatar
cgrenier
Site Admin
Posts: 3619
Joined: 18 Feb 2012, 15:08
Location: Le Perreux Sur Marne, France
Contact:

Re: Recovering a NTFS partition corrupted by Mac

#2 Post by cgrenier » 03 Jun 2016, 07:23

Use TestDisk 7.1-WIP, it will not display this warning message useless for EFI GPT.

mcfchan
Posts: 3
Joined: 02 Jun 2016, 09:01

Re: Recovering a NTFS partition corrupted by Mac

#3 Post by mcfchan » 03 Jun 2016, 08:29

Hi I using EFI FPT type and the Quick Search shows below:

check_FAT: Unusual media descriptor (0xf0!=0xf8)
Warning: number of heads/cylinder mismatches 16 (FAT) != 255 (HD)
Warning: number of sectors per track mismatches 32 (FAT) != 63 (HD)
EFI System 40 409639 409600 [EFI System Partition]
check_FAT: Bad number of sectors per cluster
Mac HFS 9474092 17862701 8388610 [~?~?~?M-:D^A]


it is processing per cylinder and probably take more than 10 hrs to complete. will this recover the whole partition after Quick Analyse?
Thanks
cgrenier wrote:Use TestDisk 7.1-WIP, it will not display this warning message useless for EFI GPT.

User avatar
cgrenier
Site Admin
Posts: 3619
Joined: 18 Feb 2012, 15:08
Location: Le Perreux Sur Marne, France
Contact:

Re: Recovering a NTFS partition corrupted by Mac

#4 Post by cgrenier » 04 Jun 2016, 07:15

For a fast check, choose Stop, Deeper Search, Stop. If you see your NTFS partition, set it to P(rimary). On next screen, choose Write, confirm, Quit and restart your computer.

mcfchan
Posts: 3
Joined: 02 Jun 2016, 09:01

Re: Recovering a NTFS partition corrupted by Mac

#5 Post by mcfchan » 18 Jul 2016, 10:47

Hi As shown in last post, can you show me if the partition can be recovered? Thanks!

Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests