After SBS 2003 R2 reinstall 4TB RAID5 array not present in disk manager

I had to reinstall SBS2003R2 after a bad stripe on the OS Partition caused lots of instability. (I have good backups, so this didn't phase me.)

I followed the article to reinstall the OS from the CD-ROM product and reapplied the SP1 (I wasn't using SP2) upgrade.

Now, when I look in My Computer the 4TB partition based on a RAID5 array isn't present. This is on an Adaptec 5085 controller.

However, the 950GB partition based on a RAID1 array is present on the same controller.

My OS is on an Adaptec 2820SA controller which has 2 other partitions on it as well.

Why is my 4TB partition visible in Adaptec Storage Manager but not visible in My Computer or SBS Storage Disk Management?
Marcus NTeacherAsked:
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DavidConnect With a Mentor PresidentCommented:
Not all controllers handle LUNS > 2.09TB.  So check that your controller does actually work, and make sure you have the firmware & drivers updated.

Also you Need SP1 properly installed so it supports the 16-byte SCSI commands required to even address anything over that limit.   Part of the update is most likely drivers.

Probably, you just need to re-apply the adaptec drivers.
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Marcus NTeacherAuthor Commented:
This all worked before so everything must have been done to make sure it works. The 4TB array is the one with all the user data on it and has always been visible.

I have updated the firmware and drivers.

None of my devices are SCSI they are all SATA.

Is there anything that could be different in the MBR of a reinstall from the MBR of the last working configuration?
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Marcus NTeacherAuthor Commented:
Hi, I discovered that you were right and that the solution was relatively simple. Once I reinstalled SBS 2003 SP1, there was a fix in the service pack that enabled arrays of greater than 2TB to be recognised.

The array now appears in Disk Manager and I can access the data.
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