Abit AH6E Pentium II, Руководство пользователя, Страница: 59 / 84

G en eral D iscu ssion abou t H D D In stallation
B -1
A ppendix B G eneral D iscussion
A bout H D D Installation
M o st o f the present H D D s use ID E interface. Installing an ID E hard disk
do es no t require a lo t o f kno w ledge like installing the driver fo r a S C S I hard disk,
but this means that the user o ften must install the hard disk by himself and co pe
w ith all the pro blems he may enco unter. H ere, w e w ill try to help yo u so lve
these po tential pro blems.
T he data sto red in the hard disk are accessed thro ugh the chipset lo cated o n
the mainbo ard. Y o u might o ften hear abo ut the P IO mo de, M aster mo de o r
D M A mo de o f H D D . T hese mo des reflect the w ay data is transferred fro m and
to the ID E drive and the mainbo ard.
W hat is the P IO mo de? W hen the system needs to access hard disk data,
the C P U delivers input/o utput (I/O ) o rders thro ugh the chipset o n the mainbo ard
to the hard disk drive, and than puts these data into the system memo ry. T his is
the P IO mo de.
W hat is the M aster mo de? W hen the system needs to access hard disk data,
these data are directly accessed fro m the hard disk by the chipset o n the
mainbo ard (using a D M A o r a P IO mo de), and then the data is put into the
memo ry. In this case, the C P U do es no t participate in the data transfer.
W hat is the D M A mo de? U sually, D M A mo de refers to accessing the hard
disk data by the chipset, it do es no t refers to data transfer mo de.
H ere are so me examples o f data transfer rates fo r ID E H D D w ith P IO
interface:
P IO M o de 0 T he fastest data transfer rate reaches 3.3M byte/sec
P IO M o de 1 T he fastest data transfer rate reaches 5.2M byte/sec
P IO M o de 2 T he fastest data transfer rate reaches 8.3M byte/sec
P IO M o de 3 T he fastest data transfer rate reaches 11.1M byte/sec
P IO M o de 4 T he fastest data transfer rate reaches 16.6M byte/sec