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Spliting 4tb hardrive to 2 patitions on their own drive

perdeal 839 78 September 24, 2016 at 12:35 AM
I have a 4TB Seagate Backup Plus portable hard drive and it turns out there are two 2TB in a RAID 0. If one of the of the two was to fail, the data on the other drive would also be compromised.

When I deleted the partitions and tried to format it, one of the partitions was 2TB and the other 1.6TB. At that point I was able to assign a letter and initiate the 2TB but not the other.

Is there any way to set it up so the two drives are independent from each other (2 different partitions on their own drive) ?



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What OS are you using?

Your comment about deleteing partions and reformating leaves me to believe that you know what you are doing. So any suggestions i make i feel you probably already did but we have to start somewhere.

I would check disk manager under computer management. If there are really two drives, it show up there and you can play with the options to get them going. However, I think the issue comes from the sw in the case itself that is doing the raiding.

When you said you saw 1.6t on one of the drives that says to me that the computer is still looking at the drives together. A single 2 tb drive is not going to loose 25% storage capacity unless it is poorly formatted or the drive is loosing sectors.

If you can delete the raid software, that should work.

Have you tried opening the case, removing the drives, and formatting them separately? That is worth a try, then put them back in the case and see what happens.
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You aren't splitting a 4TB drive into two 2TB drives. You're trying to split a 4TB RAID volume. You have two 2TB drives that have been combined through RAID 0 software to act as a single 4TB volume that consists of two 2TB physical drives. Even if you do split the 4TB volume into two partitions, you still have your data striped across both drives, so your data is no safer than when you began. If either drive fails, the volume is destroyed Frown

Is there a way to disable RAID on the controller for the external unit? If not, then you won't be able to use the drives separately, at least not while still in that enclosure. You want each drive to show up as an individual drive, NOT as one giant drive that can be partitioned.

Now for some math... Wink A 4TB drive (or volume, in this case) is actually right around 3.6TB. So if you selected 2TB as the size for the first partition, guess how much space was left in the volume. 3.6TB - 2TB = 1.6TB. Does that 1.6 TB look familiar?
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