Discrepancy in reported & actual size capacity, Raid 1+0 – Oyen Digital DATATALE RC-M4QJ 4-BAY RAID User Manual
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Q:
I would like to format my hard drives with the FAT (a.k.a. File Allocation Table)
format, which can be read and written by both Mac and PC. Is there any
limitation on its capacity?
A:
Yes, please check the table below for reference.
File
System
NTFS
FAT32
FAT (Format by
Win2000 / WinXP)
FAT16
Capacity
Limitation
Vista: 16384TB
XP: 2TB
Windows: 32GB
Mac: 2TB
4GB
2GB
Q:
How do I increase my RAID mode’s storage capacity without losing data?
A:
When you create or rebuild a RAID, the maximum capacity provided is based
on the smallest volume of hard drive already available. Please backup the stored
data first before you swap out all the existing hard drives and replace them with
larger storage capacity ones because the RAID System will regard the new hard
drives as a new set of RAID.
DISCREPANCY IN REPORTED & ACTUAL SIZE
CAPACITY
Q:
If I have a 750GB hard drive, why does the RAID System only recognized the
hard drive available space as to be less than 750GB?
A:
Many customers are confused by their host systems when it reports a
discrepancy between reported capacity and actual capacity. Several factors can
come into play when your host system views and reports the capacity of a hard
drive. There are actually two different numbering systems used to express units
of storage capacity:
Binary, which says that a kilobyte is equal to 1024 bytes; and
Decimal, which says that a kilobyte is equal to 1000 bytes.
Most commonly used to display storage capacity is in Decimal. The surprising
fact is that even though it seems like you will have more bytes under Binary, the
Decimal calculation system actually presents a greater storage capacity. More
description on capacity issues can be found at the Seagate website under FAQs.
http://www.seagate.com/ww/v/index.jsp?locale=en-
US&name=Storage_Capacity_Measurement_Standards_-
_Seagate_Technology&vgnextoid=9493781e73d5d010VgnVCM100000dd04090aRCRD
RAID 1+0
Q:
Normally when operating under the RAID 1+0 mode, two hard drives are
allowed to fail without losing the data. Is there any special restrictions or
limitations for the RAID System?
A:
As long as the two failed disks are not in the special combination of hard drive
slots nos. 1&2 or 3&4, the data can be rebuild once the failed disks are replace
with new ones.