Ram and Hard Disk

I want to buy a new hard disk and ram for my computer ,what are the features of a good ram and hard disk?(right now i have a 256 ram)

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The right answer would depend on what is compatable with your computer, which you haven't mentioned at all.  

In general for RAM, higher capacity is good, higher bandwidth is good (the PC designation), lower latency is good, and dual channel is good (if your motherboard can handle it).  Then there is the brand to consider, because some, like Crucial, Kingston HyperX, OCZ, Mushkin, Corsair, and Patriot are preferred by overclockers because they are stable when pushed beyond the normal settings.

For a hard drive, what is desirable is fast access time, high rotational speed, large disk buffer, a reputation for reliability (good warranty also), quiet operation, and low heat buildup.  I like Seagate for this reason.
You can never have too much money or too much RAM.  While 256MB is a good all-around amount for a home PC, depending on your intended use, more may be better.  If you are doing heavy software development, graphics processing, database work, or run many applications at once, 512MB or even 1GB might be better.

The story for hard drives is about the same.  Today even gigantic hard drives are cheap, so in my view, 160GB or larger is not unreasonable.  Any more about the smallest drive you can buy is 80GB.  Below that the cost remains almost the same or (oddly) even goes up.

If you are upgrading an existing PC, chances are you have an ATA100 or 133 hard drive interface.  It probably makes sense to stay with ATA vs. switching over to SATA.
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Depends what your pc will be used for,

512mb of ram is recomended for many applications. though 1gb or more will allow for a faster running pc when it comes to games, or other demanding applications.

Hard drive, all dependes on how much your willing to pay, how much storage you require and what your motherboard will allow.
you could splash out on a WD Raptor for a (10,000rpm drive) sata, but there are plenty of other capable (7500rpm) drives
which are much more affordable with larger storage.

What other hardware is in your pc?
BTW, I agree with Callandor on Seagate drives.  While the rest of the industry recently went from a 3-year standard warranty to a lousy and short 1-year warranty.  Seagate is offering a 5-year warranty on their drives.  That's a BIG DEAL in my opinion.
Warrenty is deffinitly an important factor to consider,Our Maxtor's for the network where brought with 3 year warrenties, which proved very usefull, as a few are begining to fail now.

But you also find that High end drives like western digitals raptors which I think the internal architecture is very similar to SCSI when it comes to reliability (correct me if I am wrong) but in my expirience, high end drives are less likely to fail, and at there price they have to be, or they dont sell.
Anyway SATA might be out of the question dependeing on your motherboard.
You can buy OCZ low latency RAM... usually more expensive of course... and comes in a matched pair if your motherboard supports dual-DDR.
Then you can use aggressive memory timing settings in your BIOS. (to make it faster)

As for Hard Drive... the more cache and warranty and speed the better.  Usually some manufacturers have 3 to 5 year warranties now... depending on which drive you buy.
You might want to check out the Maxtor Maxline 3 drive. 16MB cache and 7200rpm. Very fast and big capacity.  Seagate is good, or western digital.  SCSI is very nice but expensive.

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entrance80Author Commented:
SATA seems to be very good , now how can i find some information about my motherboard ?
I wanna see if  i can use SATA on my computer or not....!!!

How old is your motherboard or system?  Unless you've just recently purchased it the chances are near 0 that it has SATA.  SATA has only started appearing in system within the last year.  And even today it's probably less than 50% of systems due to the higher cost of SATA motherboards and drives so far.
Can I suggest that you post to us the Manufacture and model name of as much of the hardware that you know is inside your computer (you will find this information is printed on a obvious and visible part of each piece of hardware)(usually)

Obviously the most usfull information you could give is the Motherboard's manufacturer and model name, as this will not only determin the type of hard drive which is avaliable to you, but will also determin the type of RAM avaliable to you[eg. DDR, DDR2, RIMM, SO DIM, SDRAM, ECC, non ECC, and what speads are supported 333, 400... I could go on but Im sure you get what I'm trying to say, there are many different varients of computer hardware out there these days, and in my oppinion your random access memmory (RAM) is one of the main offenders.

So you must be sure that the RAM which you order is fully supported aswell, not just the hard drive
See if you can see the manufacturer or model name and post it for us.

Just brought myself another GIG of Kingston HyperX , arives thursday :o)
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