PDA

View Full Version : What is UDMA/33 IDE ?


SpeedEng
12-07-2001, 07:24 PM
can some one tell me?
Clauzii
12-08-2001, 07:32 AM
Originally posted by SpeedEng
can some one tell me?

A hardware interface for HDs.
The UDMA means UltraDirectMemoryAccess, and is used to transfer data from your HDs directly to the RAM in your machine, without using the CPU for every Read/Write operation.

Besides that UDMA/33 is about dead...
Now it is UDMA/66 or UDMA/100.

The number btw. is telling the (theoretical) maximum of MBytes transferred per second: 33 MByte, 66 MByte or 100 MByte.
With todays HDs, we see a maximum of around 20 to 40 MBytes/Sec.
So a lot of bandwidth go wasted, u think?!
Well, if we have two drives each loading UDMA at the same time, it actually is not that much anyway...
SpeedEng
12-08-2001, 10:32 AM
so if my mother board supports UDMA/33 does that mean I have a UDMA drive, or is there any way to know what type of hd I currently have?
TommyBoomfiger
12-08-2001, 06:05 PM
Originally posted by SpeedEng
so if my mother board supports UDMA/33 does that mean I have a UDMA drive, or is there any way to know what type of hd I currently have?

this means that your mobo can support UDMA33, but you can run any kind of ide hard drive. if you put a hd that is faster than UDMA/33 such as UDMA/66, it will only run at 33. if you put a slower hard drive, it can run at the hard drives fastest ability.
Clauzii
12-09-2001, 09:29 AM
Originally posted by SpeedEng
so if my mother board supports UDMA/33 does that mean I have a UDMA drive, or is there any way to know what type of hd I currently have?

When your computer is booting up, it is shown on the screen, what kind of CPU, Cache etc., AND what kind of transfer mode all your drives are using. (U have to hit the PAUSE key, to see it.)