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R T X 4 0 0 - U R & R T X 6 0 0 - U R U s e r ’ s M a n u a l - 10 -
NOTE: When formatting a volume larger than 2TB in
Windows Vista, you may be prompted to select either
MBR or GPT for initialization. MBR will truncate the
volumes to 2TB each, creating multiple partitions if
necessary. GPT will allow volumes over 2TB, but is not
compatible with all previous versions of Windows.
Working with Volumes over 2TB (2,000GB) in size
Although the RTX can create volumes larger than 2TB, operating systems cannot usually access such
volumes. This is because most systems support only 32-bit LBA (Logical Block Addressing).
Newer operating systems (Windows Server 2003, Vista, Mac OS 10.5.x) should be able to use 2TB+
volumes without difficulty. You will simply need to do one of the following two things while creating the
UDV (User Data Volume):
• Change the LBA to 64-bit
• Increase the block size to 4096
Neither option will work for Windows versions before Server 2003. You will need to make more than one
UDV, giving each a different LUN. To do this, simply change the capacity when creating the UDV.
Although Mac OS 10.4.x supports only 32-bit LBA, increasing the block size to 4096 will allow you to
create a 2TB+ volume that is usable by the OS.
Versions of Linux vary, but using one of the above methods may allow you to create a 2TB+ volume that
your distribution can use.
Warnings and Notices
• RTX products feature TrayFree technology which allows easy insertion and removal of hard
drives. However, removing a hard drive that is part of a RAID can cause the RAID to be
corrupted. It is recommended that you only remove a hard drive if the drive has failed (signified by
an alarm). You can swap complete sets of RAIDed drives, but only if the RTX is powered off while
removing one set and inserting another. Keep sets of drives from the same RAID clearly marked
so they are not mixed up with drives from a different set.
• Use only hard drives that are in perfect condition. Avoid using drives that have ever developed
bad sectors during previous usage. This could lead to possible device failure or loss of data.
• The RTX supports SATA hard drives of various specifications and different capacities. However,
we recommend using drives of the same brand and type for optimal performance. If drives of
different capacities are used, the capacity of the smallest drive will determine how much of each
drive is used. The additional capacity on the larger drives will not be used by the RAID.
• Always back up data before switching RAID types. You must reformat your drives afterwards.
• RAID level 0 will allow you to use the full combined capacity of the drives, and offers the best data
transfer speeds. However, RAID 0 offers no protection for the data. If one drive fails in a RAID 0,
the data on all of the drives is irretrievably lost. Before creating a RAID, investigate the various
RAID types and choose the one that is best for your needs.
(9 pages)
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