I'm a new user.
This machine is a Dell XPS 8100 (8GB Ram). The original RAID0 Array failed (after two years).
I set up a RAID1 array using two factory-fresh WD 1 TB drives. One of these drives failed, after less than six months. WD's customer support is worthless: babbling morons, who shipped mis-matched drives (500GB and 1 TB [re-certified = junk]).
I have two, 1 TB Seagate drives, factory-fresh. I want to install one, rebuild the RAID1 Array, and then replace the WD drive with a factory-fresh Seagate 1 TB drive, and again re-build the arry. The "working" WD drive will be cleaned and dumped: it is junk.
The computer boots and runs. Having installed a 1 TB Seagate drive (just as it came from the box), I expected - silly me - that the rebuild would be smooth.
The system sees the drive. But when I try to rebuild the array, I get a message: "Not enough space to create the volume". This is one of those messages that is accurate but totally useless, as it does not offer any insight into what to do.
I have two drives of precisely the same capacity. The Seagate drive is in exactly the same condition, as it was, when I took it from the shipping carton.
What does the error message mean and how do I get the Array rebuilt?
Thanks for your kind help. I appreciate it.
The error isn't totally useless. As we know when replacing an array disk drive the new disk MUST BE the same size or larger than the one being replaced. That's common knowledge. If the Western Digital HDD is physically even one byte larger that the Seagate (not the stated marketing size but actual physical size) then the message is appropriate.