LG Network Attached Storage with built-in Blu-ray Rewriter N4B1 - Manual (Page 66)

. LG NAS Web Menu Use (for LG NAS administrators)

) Capacity (Used/Total)
The amount used and total capacity of volume are displayed. The percentage of
capacity used (Used/Total) is indicated by the bar on left and full capacity (Total) is
indicated by the bar on the right.
∙ Note 1) Total storage represents total available storage, which is defined by file
system and RAID level.
The ext3 file system of the LG NAS occupies 1.5% of the total HDD storage, thus
the actual available storage in a volume is approximately 98.5% of the total
user storage. When using one HDD per volume (single disk), the total storage is
equal to the actual available storage of a HDD. The total storage of a RAID-
based volume differs according to RAID level (JBOD / RAID0 / RAID1 / RAID5 /
RAID10). For JBOD, the total available storage is the sum of the actual available
storage of each HDD. For RAID0, the total available storage is the actual
available storage of the smallest HDD multiplied by the number of HDDs. For
RAID1, the total available storage is the actual available storage of the smallest
HDD. For RAID5, the total available storage is the actual available storage of
the smallest HDD multiplied by (the number of HDDs minus 1). For RAID10,
which is composed of 5 HDDS, the total available storage is twice that of the
actual available storage.
∙ Note ) The represented size of the HDDs differs depending on manufacturer
and OS.
HDD manufacturers use an exponent of 1000 while OSs such as Microsoft
Windows use exponents of 1024. The total available storage on the LG NAS is
represented by the exponent 1024.
∙ Note ) Volume storage of the LG NAS is the total HDD storage without the
system area and the swapping area.
If for example a volume is configured with a 1TB HDD, with 1x10
12 bytes of
storage, user area will be as follows: 1x10 12 - 2x10 9 (system area) - 256x106
(swapping area) = 997744000000 bytes. This becomes 929Gb when converted
using the exponent 1024.