WD VelociRaptor 10krpm 300GB

[Lacus]

But then SSD HDD are quite costly now. And what i heard from max it also has disadvantage. can't stop remembering what our lecturer said when we answered some question in the tutorial class (hardware question)

[Adrian Wong]

Originally Posted by Lacus

But then SSD HDD are quite costly now. And what i heard from max it also has disadvantage. can't stop remembering what our lecturer said when we answered some question in the tutorial class (hardware question)

Like all flash devices, each cell in the SSDs can support a limited number of writes. So flash devices always have a certain number of spare cells and write levelling algorithms to ensure the fewest dead cells possible.

Also, their transfer rates cannot match that of HDDs. They have very fast access times but low sustained transfer rates.

[lee_what2004]

Originally Posted by Adrian Wong

Like all flash devices, each cell in the SSDs can support a limited number of writes. So flash devices always have a certain number of spare cells and write levelling algorithms to ensure the fewest dead cells possible.

Also, their transfer rates cannot match that of HDDs. They have very fast access times but low sustained transfer rates.

I never knew that

so for hdd, is it the same? with limited number of write?

[miahman]

this is what i think.

if a piece of technology is expensive. it will sell but it will not go mainstream until the price of that technology drops to a level where avrage joes can buy it.

[Adrian Wong]

Originally Posted by lee_what2004

I never knew that

so for hdd, is it the same? with limited number of write?

No.. HDDs use physical platters with a media substrate. Totally different concept. HDDs are more fragile, of course. You can't drop one while it's running and expect it to survive.

An exception would be notebook hard drives with G sensors that detect a drop and park their heads before it hits the ground. Still, it's not as robust as flash drives.

[Chai]

Originally Posted by Adrian Wong

Like all flash devices, each cell in the SSDs can support a limited number of writes. So flash devices always have a certain number of spare cells and write levelling algorithms to ensure the fewest dead cells possible.

Also, their transfer rates cannot match that of HDDs. They have very fast access times but low sustained transfer rates.

Cannot match? Are you sure?

AnandTech: MTRON MSP 7000 SSD - Raptors Beware

[ChampionLLY]

Actually SSD does have a low transfer rate:
AnandTech: Transcend 16GB SSD

[Chai]

Originally Posted by ChampionLLY

Actually SSD does have a low transfer rate:
AnandTech: Transcend 16GB SSD

Look at my post. If the high end has the potential of hitting 110MB/sec transfer rate, then I don't see any reason why they can't do it in the future.

[hjlavery]

Originally Posted by Adrian Wong

I think you mean smaller laptops like the ASUS EeePC? Somehow I don't see SSDs replacing HDDs mainly due to cost and capacity reasons.

there are others that have SSD like this one here and this one here

Still expensieve, ill grant, but they do exist

[Adrian Wong]

Originally Posted by Chai

Cannot match? Are you sure?

AnandTech: MTRON MSP 7000 SSD - Raptors Beware

That's the platter/cell transfer rate. They need to use something like IOMeter to check the actual transfer rates of both small files and large files. Then we will know the SSD's actual performance.

In any case, performance is only one issue. Cost and capacity are bigger issues for the SSDs. They have trouble lowering the cost.. and increasing the capacity.

Look at that SSD drive you post. It may be really fast but it only has 32GB of storage. That's just over 10% of what the new WD VelociRaptor can do.

IMHO, for SSDs to really beat HDDs, they don't really have to be faster in transfer rate performance. They must first tackle the capacity issue... and the cost issue.