The Official HDD Benchmark Thread

BHills

BHills

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bencheongcm said:
plz dun ever use burst speed to judge how fast the HDD is.... when burst speed occur, it would las only as fast the a blink of a eye. NOT CONSTANCE

I dunno why after so many years I am still saying this same thing over and over again...
Click to expand...


You're really noob and missed my point totally. :eek::D:s8:

The limit for burst rate is the max. of the interface through which the HDD is connected. If you connect by ATA 133, you can't get over 133 MB/s even if the data is read from the HDD cache (i.e. steady state kind of memory). Likewise, the limit for SATA I and II are 1.5 Gb/s (187 MB/s) and 3.0 Gb/s (375 MB/s) respectively. Even for SCSI Ultra 640, the max. is only 640 MB/s.

Basically, even when the data is from the HDD cache (i.e. the data already stored in the HDD memory without a need to seek and read the data from the platters), you cannot achieve a speed faster than the max. the interface is capable of carrying.

Modern HDDs have 4MB/8MB/16MB etc. for caches and so the burst rate reported is in most instances measured for data coming from their caches and not reading from the platters. As a result, Burst rates are usually a number not far below the max. speed of the interface used and a measure of the interface speed in practice for HDD with huge caches. (all the other burst rates numbers reported attest to this) .

Now, look at the burst rates reported : 1391 MB/s and 2378.6 MB/s.

So even if it's RAID 0, 2x SATA II would have a limit of 375 x2 = 750MB/s and even the fastest SCSI Ultra 640 interface would have 640 x 2 = 1280 MB/s for burst rates.

So my earlier point is that the 1391 MB/s and 2378.6 MB/s are crazy because it greatly surpasses the limit of the interfaces usually seen.

Got it now?

I dunno why after so many years I am still saying this same thing over and over again.. : many people don't think before they comment.
 
ragnarok95

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bencheongcm said:
plz dun ever use burst speed to judge how fast the HDD is.... when burst speed occur, it would las only as fast the a blink of a eye. NOT CONSTANCE

I dunno why after so many years I am still saying this same thing over and over again...
Click to expand...

BHills said:
You're really noob and missed my point totally. :eek::D:s8:

The limit for burst rate is the max. of the interface through which the HDD is connected. If you connect by ATA 133, you can't get over 133 MB/s even if the data is read from the HDD cache (i.e. steady state kind of memory). Likewise, the limit for SATA I and II are 1.5 Gb/s (187 MB/s) and 3.0 Gb/s (375 MB/s) respectively. Even for SCSI Ultra 640, the max. is only 640 MB/s.

Basically, even when the data is from the HDD cache (i.e. the data already stored in the HDD memory without a need to seek and read the data from the platters), you cannot achieve a speed faster than the max. the interface is capable of carrying.

Modern HDDs have 4MB/8MB/16MB etc. for caches and so the burst rate reported is in most instances measured for data coming from their caches and not reading from the platters. As a result, Burst rates are usually a number not far below the max. speed of the interface used and a measure of the interface speed in practice for HDD with huge caches. (all the other burst rates numbers reported attest to this) .

Now, look at the burst rates reported : 1391 MB/s and 2378.6 MB/s.

So even if it's RAID 0, 2x SATA II would have a limit of 375 x2 = 750MB/s and even the fastest SCSI Ultra 640 interface would have 640 x 2 = 1280 MB/s for burst rates.

So my earlier point is that the 1391 MB/s and 2378.6 MB/s are crazy because it greatly surpasses the limit of the interfaces usually seen.

Got it now?

I dunno why after so many years I am still saying this same thing over and over again.. : many people don't think before they comment.
Click to expand...

Ya ya ya...

One 2002 and one 2004...
 
ER

ER

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jtchoy said:
:s34:

My msn avatar got my face... Firefox lor... :s13:
Click to expand...

You mean this? :D

firefoxlogovu3.jpg
 
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