PrimeArray 4xxx, User Manual, Page: 74 / 208

Volume Usage and Status
On-line The hard disk is a member of a
mounted volume which is ready for
data access.
No init The hard disk is not initialized yet. A
no-init disk must be a free disk, which
can be used to create a volume or
be assigned as a hot-spare disk.
Defective The hard disk contains bad sectors.
Off-line The hard disk is not mounted and not
accessible.
Backup/Archiving Devices
These are either CD/DVD-ROM drives, CD/DVD writers or tape
drives.
Type indicates what kind of device it is. Mode indicates
the data transfer mode of the storage device interface.
Device type could be CD-ROM, CD-R, CD-RW, DVD-ROM,
DVD+R, DVD+RW, DVD-ROM+CD-RW or Tape.
Data Transfer Modes
Data transfer modes could be PIO x, DMA x, MDMA x, or UDMA
x. PIO means Programmed Input/Output, of which data
transfers are performed by host CPU. DMA means Direct
Memory Access, of which data transfers are done by device
controllers and use little host CPU time. MDMA is multi-word
DMA. UDMA is Ultra DMA, which is a faster DMA mode.
PIO Modes PIO Mode 2: 8.3 Mbytes/sec
PIO Mode 3: 11.1 Mbytes/sec
PIO Mode 4: 16.6 Mbytes/sec
DMA Modes Multiword DMA Mode 2: 16.6Mbytes/sec
Ultra DMA Mode 2: 33 Mbytes/sec
Ultra DMA Mode 3: 44 Mbytes/sec
Ultra DMA Mode 4: 66 Mbytes/sec
Ultra DMA Mode 5: 100 Mbytes/sec
Ultra DMA Mode 6: 133 Mbytes/sec
Chapter 5
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