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LunchBox
01-29-2002, 01:00 AM
Is ATA 133 backwards compatible with ATA 100?

Darthtanion
01-29-2002, 03:33 AM
I haven't tried one yet, but yes... it is supposed to be backwards compatible.

Albinus
01-29-2002, 09:16 AM
AFAIK the ATA/133 drives should be fine on an ATA/100 controller :)

choovak
02-07-2002, 11:19 PM
Yes, Just like ATA33/ATA66/ATA100 its all backward compatible

T-Shirt
02-08-2002, 06:48 PM
ATA 133 is not yet an industry standard. (owned by Maxtor)
However, it was designed to be full backward compatible.
The higher transfer rate of 133 MB/sec is achieved by shortening the cycle time from 40 ns (ATA 100) to 30 ns (ATA 133).
A couple good reads


http://www.maxtor.com/products/fastdrive/whitepaper.htm

Raid/133 (http://www.overclockers.com.au/techstuff/a_raid0_ata133/index.shtml)

brashquido
02-09-2002, 08:22 AM
There are some fairly large architectural changes in the ATA-133 format. The major ones I can see is the 48-bit address bus and and the 137GB limit on the other ATA formats. If you have one of Maxtors new 160GB HDD's, how is a ATA-100 controller giong to see it all if it's address bus limits it to 137GB? Me thinks I may have to do some reading on this!

Wiggo
02-09-2002, 08:35 AM
Partitioning. :smokin:
:cheers:

brashquido
02-09-2002, 11:56 AM
Partitioning. :smokin:
:cheers:

Partitioning won't do it because the 137GB limit is the physical limit of what the controller on pre ATA-133 can address. You can only partition a drive if the controller can address it!

Birdkiller
02-09-2002, 01:03 PM
Maybe there is some Ontrack type software to get around the 137Gb limit, like with computers that have an 8Gb limit

brashquido
02-09-2002, 01:11 PM
If they're claiming ATA-100 backwards compatability, I'd say they've got some trick like that up their sleeve. As T-Shirt posted, there are some good links regarding ATA-133 off the Maxtor site.

T-Shirt
02-09-2002, 10:48 PM
Partitioning won't do it because the 137GB limit is the physical limit of what the controller on pre ATA-133 can address. You can only partition a drive if the controller can address it!
Brash is correct, an ATA-100 will not ba able to see more than 137Gb
no matter how large your physical disk or array.
But a ATA133 controller is backwards comp. with all previous ATA drives
If you really need 160Gb of storage now
a}buy a pair of 80's (priced about the same, could be used in a raid, greater reliablity( aleast one should work))

b}upgrade motherboard or buy a PCI ATA133 controller card, along with the drive.
If your just looking towards future needs, STOP! serial-ATA is coming, prices on ATA133 drive will continue to drop.
Buy about what you need for 3 years.

brashquido
02-10-2002, 06:06 AM
Brash is correct, an ATA-100 will not ba able to see more than 137Gb
no matter how large your physical disk or array.
But a ATA133 controller is backwards comp. with all previous ATA drives
If you really need 160Gb of storage now
a}buy a pair of 80's (priced about the same, could be used in a raid, greater reliablity( aleast one should work))

b}upgrade motherboard or buy a PCI ATA133 controller card, along with the drive.
If your just looking towards future needs, STOP! serial-ATA is coming, prices on ATA133 drive will continue to drop.
Buy about what you need for 3 years.

Thanks for your reply T-Shirt,

I'm actually looking to setup a 480GB volume using an IDE Hardware RAID 5 controller card and 4 X Maxtor 160GB HDD's. Currently there seems to only be ATA-100 RAID 5 cards, so I might just hang back for a bit until the whole ATA-133, ATA-100 compatability thing becomes a bit clearer.

What are the advantages of serial ATA, and when is it expected to hit the market?

brashquido
02-12-2002, 09:53 AM
Is ATA 133 backwards compatible with ATA 100?

I just received e-mails back from Maxtor and Promise.

Maxtor say the address bus issue with ATA-133 being a 48-bit address bus, and ATA-100 having a 28-bit address bus will be overcome (with Windows 2000 anyway) with Service Pack 3.

For people looking for an ATA-133 RAID 5 card, the response I received from Promise said they are planning to release one, but didn't specify a release date.

T-Shirt
02-20-2002, 12:38 AM
The recently released Intel Accelerator Application v.2
now support 48bit addressing, win 98SE and up are able to see
beyond 137GB