the speed rate of 5400rpm, 7200rpm, 10,000rpm HDD sata3

[metaclay]

Hi,
As far as i know , SATA3 interface can transfer about 750MB/s. So how many MB/s these 5400,7200 and 10,000 rpm sata3 HDD can deliver regardless the Brand and regardless the speed of sata3 interface itself.

 

[TwilightRavens]

Hi,
As far as i know , SATA3 interface can transfer about 750MB/s. So how many MB/s these 5400,7200 and 10,000 rpm sata3 HDD can deliver regardless the Brand and regardless the speed of sata3 interface itself.

SATA3 speeds can deliver a maximum of 6Gb/s. source: https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.0_.286.C2.A0Gbit.2Fs.2C_600.C2.A0MB.2Fs.2C_Serial_ATA-600.29

But from what I know a 5400 RPM HDD is limited to ~250 MB/s. A 7200 RPM to ~350MB/s and a 10,000 to maybe 500-600MB/s but... that's not taking into account overhead and stuff. So therefore the speeds can vary especially when it comes to sequential read/write and random read/write.

A cheap SSD would out perform even the most high end HDD from my experience.

 

[odysseepictures]

Hi,
As far as i know , SATA3 interface can transfer about 750MB/s. So how many MB/s these 5400,7200 and 10,000 rpm sata3 HDD can deliver regardless the Brand and regardless the speed of sata3 interface itself.

SATA3 speeds can deliver a maximum of 6GB/s. source: https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.0_.286.C2.A0Gbit.2Fs.2C_600.C2.A0MB.2Fs.2C_Serial_ATA-600.29

No, metaclay was absolutely correct. SATA3 does not transfer at 6GB/sec, it transfers at 6Gb/sec (as you can see in the link you provided). GB = gigabyte, Gb = gigabit. That's 1/8 the speed of 6 gigabytes per second, which comes to 750 MB per second.

I would have thought this was a typo (although computers give us zero room for typos in cases like this), but it looked as though you were making a correction, and actually 750MBps is right on the money.

As to the question, there are a lot of factors that feed into a drive's speed. You have to remember that a 500GB drive and a 2TB drive may have the same platter size, and therefor the data density will be completely different. I.E, the platter on the smaller (less dense) hard drive would have to rotate 400% more to read the same amount of data on the larger (more dense) drive. Another thing to keep in mind is that the speed actually varies wildly when reading from the inner most tracks to the outer most.

Even the fastest rotating drives measure a sequential avg speed far lower than 3Gbps, so there really is no need for SATA III unless you are using a SSD or a bluray player (these require speeds exceeding 3Gbps to play smoothly, and will be quite choppy using an older SATA II interface.)

 

[TwilightRavens]

Hi,
As far as i know , SATA3 interface can transfer about 750MB/s. So how many MB/s these 5400,7200 and 10,000 rpm sata3 HDD can deliver regardless the Brand and regardless the speed of sata3 interface itself.

SATA3 speeds can deliver a maximum of 6GB/s. source: https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.0_.286.C2.A0Gbit.2Fs.2C_600.C2.A0MB.2Fs.2C_Serial_ATA-600.29

No, metaclay was absolutely correct. SATA3 does not transfer at 6GB/sec, it transfers at 6Gb/sec (as you can see in the link you provided). GB = gigabyte, Gb = gigabit. That's 1/8 the speed of 6 gigabytes per second, which comes to 750 MB per second.

I would have thought this was a typo (although computers give us zero room for typos in cases like this), but it looked as though you were making a correction, and actually 750MBps is right on the money.

As to the question, there are a lot of factors that feed into a drive's speed. You have to remember that a 500GB drive and a 2TB drive may have the same platter size, and therefor the data density will be completely different. I.E, the platter on the smaller (less dense) hard drive would have to rotate 400% more to read the same amount of data on the larger (more dense) drive. Another thing to keep in mind is that the speed actually varies wildly when reading from the inner most tracks to the outer most.

Even the fastest rotating drives measure a sequential avg speed far lower than 3Gbps, so there really is no need for SATA III unless you are using a SSD or a bluray player (these require speeds exceeding 3Gbps to play smoothly, and will be quite choppy using an older SATA II interface.)

Ah sorry meant Gb and put it as GB as it was late at night, But yeah I was roughly translating to MB/s