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hard drive

Posted on 2006-11-22
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What is the different between 5400 & 7200 rpm?
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Question by:VBdotnet2005
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by:dacz
ID: 18001186
7200 rpm is more faster in performance than 5400 rpm.
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by:The_Professional
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These are the maximum speed that a HDD will spin to during use or put another way refers to how many times the spindle makes a complete 360 degree turn in any single minute.

You will rarely see 5400 drives any more as they are the older of the technologies.

The norm these days is 7200 rpm in either PATA or SATA interface, however there are 10,000 & 15,000 rpm drives in SCSI interface and I beleive a 10,000 rpm in SATA (Raptor).
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by:dacz
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by:nobus
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the access time will be shorter on a 7200 drive.
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by:Mnf
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by:AlexNek
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If you want to choose a new hard drive I recommend  to look at 10000 rpm. like WD Raptor.
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garycase earned 100 total points
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"... the access time will be shorter on a 7200 drive ..." ==> Not necessarily.   While it is true that the drive manufacturers generally put better (faster) seek mechanisms on their faster drives; the access time is determined by two factors:  (1)  seek time (time to move the heads to the correct cylinder), and (2) rotational latency (waiting for the correct sector to rotate under the heads).   #1 has NOTHING to do with the rotational speed of the drive.  (#2 obviously does)

But clearly the faster the rotational speed of the drive, the faster the data will be transferred (given the same lineal density of the data).

Since it's difficult to even find 5400rpm desktop drives these days, I suspect this question may be related to a choice of notebook drives (VBdotnet2005 - is that correct ??).   If so, I can tell you there's a VERY nice improvement in the "feel" of a notebook when you use a 7200rpm drive :-)
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by:nobus
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>>  Not necessarily.   <<  ??  if (#2 obviously does) is true, the access time  (which is the sum of both ) will be shorter imho.
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by:garycase
ID: 18004053
In most cases it is;  but there were some very high speed actuators used on a few 5400rpm drives that allowed sub-10ms average access times that were actually better than some of the early 7200rpm drives.   My point was simple that the rotational speed does not, by itself, guarantee a faster average access time --> just a faster transfer rate (assuming the same lineal density of the data).
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by:nobus
ID: 18006222
yes, i see; if you compare different drives it is possible, but on the same drive, a faster speed will result in a shorter access time.
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