[CentOS] Strangely slow disk

[Robert Nichols]

On 12/04/2011 01:08 PM, fred smith wrote:
> On Sun, Dec 04, 2011 at 10:24:00PM +0800, Ho Chaw Ming wrote:
>> Check your bios, and make sure that you did not have IDE mode enabled and
>> AHCI is selected .
>
> Also, is this one of the "Green" series of WD disks? Those have
> a 4KB sector size, not the old/traditional 512B sector size. This has
> performance ramifications in that you must have partitions begin on
> a sector boundary or performance goes to the dogs. There are a number
> of articles about it on various geek sites, sorry I can't point you
> to one offhand.

The WDxxEADS drives have 512B sectors, _not_ 4KB sectors.

-- 
Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.