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[TIP] Seagate Debuts New Super-Fast HDDs with Write Caching - Page 2

post #11 of 33
Amazon has them for $390

http://www.amazon.com/Seagate-Enterprise-Capacity-Internal-ST8000NM0055/dp/B016AG0ITU/ref=sr_1_1?s=pc&ie=UTF8&qid=1456435499&sr=1-1&keywords=ST8000NM0055

Cheaper than the HGST helium drive but not as good on power and heat since it is full of air.
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post #12 of 33
Thread Starter 
Is that a tracked Amazon link?
post #13 of 33
Quote:
Originally Posted by Computurd View Post

Is that a tracked Amazon link?

They retail for $600 - The Vendor on Amazon is selling them for $390.

Amazon themselves, have them on sale for $420.
post #14 of 33
Quote:
Originally Posted by ASUSfreak View Post

In article it shows sustained speed is +- 250/s

But read = 164 and WRITING is even faster at 342

Not a HDD guru but is this correct?

And what does 250/s mean?


If it's 250/s it's half speed of SSD's which is nice tho...

Yes, it's probably right. Random write performance tends to be higher than random read performance on magnetic disks due to caching and NCQ/TCQ allowing the disk to reorder a small window of overlapping random write operations in the order which is most optimal for where the head is currently positioned.

The reads can come from anywhere and aren't cached. Writes can be cached.
post #15 of 33
Quote:
Originally Posted by Cyro999 View Post

Those read IOPS are still 500x slower than sata-3 ssd's

True.

Quote:
Originally Posted by jacksknight View Post

What it means is this HD will break twice as fast as most other seagate drives and there will soon be another class action lawsuit filed against them.

LOL --> don't worry I never buy SG anymore. I had 3 out of 4 replaced in my RAID once... I stick with 1 brand forever (atm tongue.gif)

Quote:
Originally Posted by Computurd View Post

I didn't notice 250/s anywhere, but i did see similar numbers in MB/s

more or less 250 that is and yes MB/s... 250/s is referring to 250MB/s...





But I figured that it's half the speed cause my SSD is like 500/s (yes MB thumb.gif)

Quote:
Originally Posted by Particle View Post

Yes, it's probably right. Random write performance tends to be higher than random read performance on magnetic disks due to caching and NCQ/TCQ allowing the disk to reorder a small window of overlapping random write operations in the order which is most optimal for where the head is currently positioned.

The reads can come from anywhere and aren't cached. Writes can be cached.
)

OK, I understand. But then why is in real life the read speed still faster than the write speed of an magnetic HDD?
   
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post #16 of 33
Quote:
Originally Posted by Computurd View Post

Is that a tracked Amazon link?

I don't know what a tracked link is. That just a link from my web browser when I went to look for the drive.
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post #17 of 33
Quote:
Originally Posted by ASUSfreak View Post

In article it shows sustained speed is +- 250/s

But read = 164 and WRITING is even faster at 342

Not a HDD guru but is this correct?

And what does 250/s mean?


If it's 250/s it's half speed of SSD's which is nice tho...

Sustained write means it is a big file, and thus wont fit in cache and wont make use of random IO write cache. So large file write is 237MB/s and random IO of very small files is 342MB/s
The write cache is only 2MB. lol. This only helps a small bit when dealing with those 4k files and random writes.
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post #18 of 33
Thread Starter 
Yup, but for OS that is the biggest problem with HDDs, the lowly 4K random write. They only occur in bursts though, and never hit high queue depths. SO... if they can improve that 4K random write enough it will seriously help if an HDD is used for an OS volume. I bet it wont be long before they put that buffer in laptop drives.
post #19 of 33
Quote:
Originally Posted by Computurd View Post

Yup, but for OS that is the biggest problem with HDDs, the lowly 4K random write. They only occur in bursts though, and never hit high queue depths. SO... if they can improve that 4K random write enough it will seriously help if an HDD is used for an OS volume. I bet it wont be long before they put that buffer in laptop drives.

The Real problem for a HDD running a OS is 4k random reads, and just reading in general. This is where a SSD is king.

For Media, and data storage. Writes are nice, but would like better reads. They didn't improve much on that front. Honestly want faster reads more than faster writes. For what I do with it. Step in the right direction.


Now make them last longer than 2 year before needing to be RMAed and we have a deal. tongue.gif

Quote:
Originally Posted by EniGma1987 View Post

Sustained write means it is a big file, and thus wont fit in cache and wont make use of random IO write cache. So large file write is 237MB/s and random IO of very small files is 342MB/s
The write cache is only 2MB. lol. This only helps a small bit when dealing with those 4k files and random writes.

It has 256MB of DRAM, so needing a large amount of cache is not needed.
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post #20 of 33
If they want to fight SSD, they should have make 10K-15K rpm HDD the new standard for consumer HDD with very competitive pricing.

It wont stop SSD from replacing HDD, but it at least will slow the adoption rate.
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