New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Other Hardware and Peripherals Other Apple systems and peripherals discussion.

Trouble with 2Tb Hard disk partitioning


Post Reply New Thread Subscribe

 
Thread Tools
westef

 
Member Since: Aug 25, 2010
Posts: 2
westef is on a distinguished road

westef is offline
Hi,

First post, so if it is not according guideline, please advise.

I bought a 2 Tb hard disk to make a backup from my windows PC that i was using at work. I divided the hard disk in two partitions and formatted them both in FAT32 format. This was done on a windows machine. The hard disk is connected by a USB-interface

I later decided that one of those partitions i wanted to use for Time-machine to backup my macbook pro (OSX 10.6.4). I thought i was better to use a MAC-format for this, so i wanted to re-format one of the partitions.

On the MAC, i used disk utitlity to ERASE the second partition and format it according the MAC OS extended (journaled). This was not successful and in finder I could no longer see the second partition. At THAT moment, I could still see the first partition. To verify my data on the first partition, I wanted to check it by connecting it to a Windows machine. The hard disk was recognized (or at least the controller), but BOTH partitions were not visible. Trying on my MAC, the first partition is ALSO no longer visible. This means I cannot see any data!

I am not sure what went wrong and if i can still salvage the data of the first partition. My guess is, something went wrong in the Master Boot Record, but I do not have much experience with this and i am afraid that any quick repair attempt, can make things worse.

Do you have any advice???

Warm regards
QUOTE Thanks
chscag

 
chscag's Avatar
 
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,429
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

chscag is offline
I'm not sure you can retrieve that data. From what you posted, I'll try to figure out what happened.... First, you must have used third party software to partition and format that 2 TB hard drive as the Windows disk manager will not format any drive or partition greater than 32 GB to FAT-32.

When you used Disk Utility to erase the second partition and then format it as HFS+ and it wasn't successful, it may have created an EFI partition at the beginning of drive overwriting the Windows partition table. Now, the drive can not be seen by Windows. I don't understand why Disk Utility can not see it unless it's unformatted and unallocated. (Which may have happened)

Here's what I suggest: Unless the lost data is critical, it might be best to attach it to your Mac and use Disk Utility to partition and format the drive.
In other words, start over.

Create two partitions. Format the first partition as HFS+ extended journaled (required for Time Machine use) and the second partition as FAT-32. But be very careful about formatting the second partition. Disk Utility will default to formatting using the GUID scheme. That will cause problems. Instead, choose Options from below and format the second partition using the MBR scheme. That works best for FAT-32 partitions.

Let us know if you need further assistance.
QUOTE Thanks
westef

 
Member Since: Aug 25, 2010
Posts: 2
westef is on a distinguished road

westef is offline
Thank you for the fast reply!

I forgot to write that indeed some of the data of the first partition is rather critical. It not only contains data that is a backup, but also data that was moved to there and does not exist anymore on any other location. So, i am looking for a way to retrieve the data.

Indeed I used third party software: EASEUS Partition Master for windows, to format the disk initially.

What would be the best/safest approach to obtain the data?

Warm Regards.
QUOTE Thanks
chscag

 
chscag's Avatar
 
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,429
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

chscag is offline
Sorry about the bit late reply.....

In order to retrieve the data, you'll need some good recovery software. I suggest trying the trial version of Data Rescue 3. If it looks like it will work to retrieve the data, buy a license. It's a bit steep ($99) but well worthwhile especially if the data is critical.

I don't know anything about the EASEUS Partition Master software except that it's free, so I can't comment on its effectiveness. I personally use an older version of Partition Magic which seems to work well, or Acronis software.

Let us know.
QUOTE Thanks

Post Reply New Thread Subscribe


« '08 Mac Pro - Dual Screens with ATI 4870 | purchase new harddrive »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
500gb WD My Passport suddenly not recognized, won't reformat,says 2TB in Disk Utility Jennifer3241 Other Hardware and Peripherals 6 11-13-2010 02:03 AM
HELP PLEASE! Hard Drive Trouble With Final Cut Pro rossauce Movies and Video 8 08-27-2010 02:16 PM
Unable to repair hard disk! Help! Imacer OS X - Apps and Games 2 01-11-2010 04:02 PM
LoOkiNg fOr a gOoD 2Tb HaRd DriVe MacMurks Other Hardware and Peripherals 2 01-04-2010 09:17 AM
Ableton 6.0.7 hard disk overload problems jofo Music, Audio, and Podcasting 1 07-26-2008 06:32 AM

All times are GMT -4. The time now is 10:29 AM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?