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ahci enabled, can I revert back

Y

Yousuf Khan

Flightless Bird
On 08/10/2010 10:09 AM, Bob H wrote:
> Then I posted this:
> When Win7 threw the wobbly, as I said it went into repair mode and I let
> it do its thing. Then it took a few reboots and repairs to enable normal
> booting.
>
> I have just checked the registry entry which I changed previously from 0
> to 3, and it is or has changed back to 0 again, so maybe the repair mode
> did that. I honestly don't know how or what happened only what has
> happened.
>
>
> So you have now clarified the above situation , in that I should not
> have made any further changes to the registry setting.
> Now the registry setting is at 0 for AHCI mode should I wish to change
> back to that in the BIOS.
>
> Thanks


Yeah, a repair is kinda like a minor reinstallation of Windows. Just
like when you install Windows for the first time, the install disk
determines whether you are running on IDE or AHCI drives, and it locks
the registry setting down based on it.

Yousuf Khan
 
B

Bob H

Flightless Bird
On 08/10/2010 17:27, Yousuf Khan wrote:
> On 08/10/2010 10:09 AM, Bob H wrote:
>> Then I posted this:
>> When Win7 threw the wobbly, as I said it went into repair mode and I let
>> it do its thing. Then it took a few reboots and repairs to enable normal
>> booting.
>>
>> I have just checked the registry entry which I changed previously from 0
>> to 3, and it is or has changed back to 0 again, so maybe the repair mode
>> did that. I honestly don't know how or what happened only what has
>> happened.
>>
>>
>> So you have now clarified the above situation , in that I should not
>> have made any further changes to the registry setting.
>> Now the registry setting is at 0 for AHCI mode should I wish to change
>> back to that in the BIOS.
>>
>> Thanks

>
> Yeah, a repair is kinda like a minor reinstallation of Windows. Just
> like when you install Windows for the first time, the install disk
> determines whether you are running on IDE or AHCI drives, and it locks
> the registry setting down based on it.
>
> Yousuf Khan


I downloaded and installed HDTune and then did some tests with it on my
sata drive.

On the Samsung HD5021J HD with IDE selected in the BIOS
For Read
Max - 63.9mb/s
Min - 113.9 mb/s
Average - 94.9 mb/s
Access Time - 12.5 ms
Burst rate - 191.8

With AHCI mode selected
Max - 113.9 mb/2
Min - 3.7 mb/s
Average - 91.9 mb/s
Access Time - 12.5 ms
Burst Rate - 196.6 mb/s

Also with AHCI enabled boot up time was 16seconds longer than with IDE mode.

So from these results I will continue to use IDE mode, unless someone
recommends different.
 
E

Ed Cryer

Flightless Bird
On 08/10/2010 20:06, Bob H wrote:
> On 08/10/2010 17:27, Yousuf Khan wrote:
>> On 08/10/2010 10:09 AM, Bob H wrote:
>>> Then I posted this:
>>> When Win7 threw the wobbly, as I said it went into repair mode and I let
>>> it do its thing. Then it took a few reboots and repairs to enable normal
>>> booting.
>>>
>>> I have just checked the registry entry which I changed previously from 0
>>> to 3, and it is or has changed back to 0 again, so maybe the repair mode
>>> did that. I honestly don't know how or what happened only what has
>>> happened.
>>>
>>>
>>> So you have now clarified the above situation , in that I should not
>>> have made any further changes to the registry setting.
>>> Now the registry setting is at 0 for AHCI mode should I wish to change
>>> back to that in the BIOS.
>>>
>>> Thanks

>>
>> Yeah, a repair is kinda like a minor reinstallation of Windows. Just
>> like when you install Windows for the first time, the install disk
>> determines whether you are running on IDE or AHCI drives, and it locks
>> the registry setting down based on it.
>>
>> Yousuf Khan

>
> I downloaded and installed HDTune and then did some tests with it on my
> sata drive.
>
> On the Samsung HD5021J HD with IDE selected in the BIOS
> For Read
> Max - 63.9mb/s
> Min - 113.9 mb/s
> Average - 94.9 mb/s
> Access Time - 12.5 ms
> Burst rate - 191.8
>
> With AHCI mode selected
> Max - 113.9 mb/2
> Min - 3.7 mb/s
> Average - 91.9 mb/s
> Access Time - 12.5 ms
> Burst Rate - 196.6 mb/s
>
> Also with AHCI enabled boot up time was 16seconds longer than with IDE
> mode.
>
> So from these results I will continue to use IDE mode, unless someone
> recommends different.


Can you safely swap back and forth with just a change to the BIOS entry?

Ed
 
E

Ed Cryer

Flightless Bird
On 08/10/2010 20:06, Bob H wrote:
> On 08/10/2010 17:27, Yousuf Khan wrote:
>> On 08/10/2010 10:09 AM, Bob H wrote:
>>> Then I posted this:
>>> When Win7 threw the wobbly, as I said it went into repair mode and I let
>>> it do its thing. Then it took a few reboots and repairs to enable normal
>>> booting.
>>>
>>> I have just checked the registry entry which I changed previously from 0
>>> to 3, and it is or has changed back to 0 again, so maybe the repair mode
>>> did that. I honestly don't know how or what happened only what has
>>> happened.
>>>
>>>
>>> So you have now clarified the above situation , in that I should not
>>> have made any further changes to the registry setting.
>>> Now the registry setting is at 0 for AHCI mode should I wish to change
>>> back to that in the BIOS.
>>>
>>> Thanks

>>
>> Yeah, a repair is kinda like a minor reinstallation of Windows. Just
>> like when you install Windows for the first time, the install disk
>> determines whether you are running on IDE or AHCI drives, and it locks
>> the registry setting down based on it.
>>
>> Yousuf Khan

>
> I downloaded and installed HDTune and then did some tests with it on my
> sata drive.
>
> On the Samsung HD5021J HD with IDE selected in the BIOS
> For Read
> Max - 63.9mb/s
> Min - 113.9 mb/s
> Average - 94.9 mb/s
> Access Time - 12.5 ms
> Burst rate - 191.8
>
> With AHCI mode selected
> Max - 113.9 mb/2
> Min - 3.7 mb/s
> Average - 91.9 mb/s
> Access Time - 12.5 ms
> Burst Rate - 196.6 mb/s
>
> Also with AHCI enabled boot up time was 16seconds longer than with IDE
> mode.
>
> So from these results I will continue to use IDE mode, unless someone
> recommends different.


I've done tests on my two HDs. One is internal SATA, 640GB; the other
USB 1TB.
BIOS setting AHCI.


HD Tune Pro: WDC WD6400AAKS-22A7B Benchmark

Test capacity: full

Read transfer rate
Transfer Rate Minimum : 59.2 MB/s
Transfer Rate Maximum : 116.3 MB/s
Transfer Rate Average : 95.6 MB/s
Access Time : 12.3 ms
Burst Rate : 141.9 MB/s
CPU Usage : 11.3%


HD Tune Pro: Iomega External HD Benchmark

Test capacity: full

Read transfer rate
Transfer Rate Minimum : 29.0 MB/s
Transfer Rate Maximum : 31.9 MB/s
Transfer Rate Average : 29.4 MB/s
Access Time : 17.0 ms
Burst Rate : 29.4 MB/s
CPU Usage : 16.7%

The access graphs were very interesting for comparison.
The internal drive had a drop line access time from 0GB to 640GB.
The USB external one was a horizontal line from 0 to 1,000GB.

Ed
 
B

Bob H

Flightless Bird
On 08/10/2010 21:18, Ed Cryer wrote:
> On 08/10/2010 20:06, Bob H wrote:
>> On 08/10/2010 17:27, Yousuf Khan wrote:
>>> On 08/10/2010 10:09 AM, Bob H wrote:
>>>> Then I posted this:
>>>> When Win7 threw the wobbly, as I said it went into repair mode and I
>>>> let
>>>> it do its thing. Then it took a few reboots and repairs to enable
>>>> normal
>>>> booting.
>>>>
>>>> I have just checked the registry entry which I changed previously
>>>> from 0
>>>> to 3, and it is or has changed back to 0 again, so maybe the repair
>>>> mode
>>>> did that. I honestly don't know how or what happened only what has
>>>> happened.
>>>>
>>>>
>>>> So you have now clarified the above situation , in that I should not
>>>> have made any further changes to the registry setting.
>>>> Now the registry setting is at 0 for AHCI mode should I wish to change
>>>> back to that in the BIOS.
>>>>
>>>> Thanks
>>>
>>> Yeah, a repair is kinda like a minor reinstallation of Windows. Just
>>> like when you install Windows for the first time, the install disk
>>> determines whether you are running on IDE or AHCI drives, and it locks
>>> the registry setting down based on it.
>>>
>>> Yousuf Khan

>>
>> I downloaded and installed HDTune and then did some tests with it on my
>> sata drive.
>>
>> On the Samsung HD5021J HD with IDE selected in the BIOS
>> For Read
>> Max - 63.9mb/s
>> Min - 113.9 mb/s
>> Average - 94.9 mb/s
>> Access Time - 12.5 ms
>> Burst rate - 191.8
>>
>> With AHCI mode selected
>> Max - 113.9 mb/2
>> Min - 3.7 mb/s
>> Average - 91.9 mb/s
>> Access Time - 12.5 ms
>> Burst Rate - 196.6 mb/s
>>
>> Also with AHCI enabled boot up time was 16seconds longer than with IDE
>> mode.
>>
>> So from these results I will continue to use IDE mode, unless someone
>> recommends different.

>
> Can you safely swap back and forth with just a change to the BIOS entry?
>
> Ed


Yes I have done just that without any problems, as the registry has not
been changed.
 
C

Char Jackson

Flightless Bird
On Fri, 08 Oct 2010 22:08:20 +0100, Ed Cryer <ed@somewhere.in.the.uk>
wrote:

>I've done tests on my two HDs. One is internal SATA, 640GB; the other
>USB 1TB.
>BIOS setting AHCI.
>
>
>HD Tune Pro: WDC WD6400AAKS-22A7B Benchmark
>
>Test capacity: full
>
>Read transfer rate
>Transfer Rate Minimum : 59.2 MB/s
>Transfer Rate Maximum : 116.3 MB/s
>Transfer Rate Average : 95.6 MB/s
>Access Time : 12.3 ms
>Burst Rate : 141.9 MB/s
>CPU Usage : 11.3%
>
>
>HD Tune Pro: Iomega External HD Benchmark
>
>Test capacity: full
>
>Read transfer rate
>Transfer Rate Minimum : 29.0 MB/s
>Transfer Rate Maximum : 31.9 MB/s
>Transfer Rate Average : 29.4 MB/s
>Access Time : 17.0 ms
>Burst Rate : 29.4 MB/s
>CPU Usage : 16.7%
>
>The access graphs were very interesting for comparison.
>The internal drive had a drop line access time from 0GB to 640GB.
>The USB external one was a horizontal line from 0 to 1,000GB.
>
>Ed
>


For the external drive, it looks like you're testing the throughput of
your USB bus.
 
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