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Solve : My HDD is very unstable or what?? |
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Answer» does this mean the first 40 GB of my disk is faster, and the slower and slower the end sectors are. Is this decresing speed normal, or my hdd is not good. What is avg read/WRITE speed of today's 5000rpm, 7200, 10000 rpm and SolidState Disks. Thank youDue to the platters spinning and the inner track spinning slower than the outer track of the platter, you do see a difference, ALTHOUGH its usually not that bad. The drive is not a variable speed drive, spinning at a somewhat constant speed. The bits are read more frequently at the outside track of the platters, while as you reach the inner track of the platter where its spinning slower in reference to the head, a maximum binary compression is finally reached where binary data is slower to be read because it is coming into position to be read slower. I feel that is why you are seeing this slope of range addressed meeting at the 160gb mark. Floppy disks way back on IBM drives were Fixed Speed, while Apple decided to use a Variable Speed Drive to squeeze in more data. If the hard drive was variable speed your data read would be a somewhat flat line of constant read speed. Some history if your interested here: http://en.wikipedia.org/wiki/Macintosh_External_Disk_Drive If you ran this drive bench mark on a solid state, you would probably get that flat line of a constant data speed since all data is immediately addressable vs a drive that is spinning and the lead edge of the data has to come into position to be read on a spinning drive, and if fragmented on the platter the drive will have to spin not just one revolution to read in the binary string, but address other areas of the disk and other revolutions will be needed to assemble all the data as a whole for that one file you are addressing. That is why defragmenting on a regular hard drive is a good thing to do and fragmentation degrades performance and overworks your hard drive. BTW: Which benchmark utility is this one...never seen it before?Have your friends try the same utility. Specs given by the manufacturers are calculated AVERAGE tines. For some drives what you have may be typical. Getting deep into Hard Drive Design is beyond the general scope of this forum. In general, you will get better performance if the drive is not full. And the OS will start busing the outer edge of the drive first. As to the real read and write speed, that can be a proprietary thing with the manufacture. They can and do use lower read and writes on the inner sectors. But that is not something you, the user, can change. |
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