SD Card speed

kevinx · Posted: Fri Jul 13, 2007 11:05 pm Post subject: SD Card speed

Does anyone know if a faster SD card would make any notable difference to the"refresh rate" of the map display of a TomTom One??

I use a Sandisk Ultra Extreme II, which has a read/write speed of 10Mb/sec and 9Mb/sec.
If I were to use a Sandisk Ultra Extreme III (read/write speed of 20Mb/sec) is this going to reflect any marked improvement?

Currently there seems a "little lag" of "my position" on the maps whilst moving (especially round bends/roundabouts etc), where the movement (on screen) may seem a bit "jittery". Would a faster card make any difference??

Odd question, I know, but lets find out!

Cheers
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HTC OneX (IceCreamSandwich), HTC DesireHD (Gingerbread) Co-Pilot Premium, GoogleMaps+CamerAlert352
TomTomOne (Original with the faster processor!)
v7.903, o/s 2344, GPSv1.21 Boot 5.0500
Mv710.1561(W Europe)+Traffic, N82 connection to GPRS traffic
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Oldboy · Posted: Sat Jul 14, 2007 7:17 am Post subject:

The card is 60x and should be adequate for TTs purposes. When going round bends, etc. it will jump slightly, especially if not on a route. This is because the data stream is updated at 1 second intervals. In that time you could have move a long way.
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Richard

TT 910 V7.903: Europe Map v1045
TT Via 135 App 12.075: Europe Map v1120

kevinx · Posted: Sat Jul 14, 2007 9:33 am Post subject:

Thanks "Richard".

You have "hit the nail right on the head", and know where I'm coming from.

I Just find it a little annoying with the "jumping", and thought a faster card (20Mb/sec) may cure this.

Thanks for your feedback.

Cheers Wink

_________________
HTC OneX (IceCreamSandwich), HTC DesireHD (Gingerbread) Co-Pilot Premium, GoogleMaps+CamerAlert352
TomTomOne (Original with the faster processor!)
v7.903, o/s 2344, GPSv1.21 Boot 5.0500
Mv710.1561(W Europe)+Traffic, N82 connection to GPRS traffic
+

Andy_P · Posted: Sat Jul 14, 2007 8:38 pm Post subject:

It's only if the card is really slow that it becomes the 'bottleneck'.

Above a pretty basic "fast" speed (say50x) the SD card ceases to be the slowest link in the chain, so any speed increase in that makes no perceptible difference.

kevinx · Posted: Sun Jul 15, 2007 12:08 pm Post subject:

Thanks Andy

Laughing

_________________
HTC OneX (IceCreamSandwich), HTC DesireHD (Gingerbread) Co-Pilot Premium, GoogleMaps+CamerAlert352
TomTomOne (Original with the faster processor!)
v7.903, o/s 2344, GPSv1.21 Boot 5.0500
Mv710.1561(W Europe)+Traffic, N82 connection to GPRS traffic
+

Steven0161 · Occasional Visitor Joined: Mar 26, 2006 Posts: 48

NukeThemAll · Posted: Mon Dec 31, 2007 3:16 pm Post subject:

I have 'graduated' from a 1Gb 133x SD card to a card which claims a read speed equivalent to 66x; I've not noticed any significant degradation of map display. I too suspect that the bottleneck would be processing speed and/or update interval and/or internal limits on read speed.

What I do find interesting is having taken advantage of TT's up to half-price map offer and purchasing the WE map (hence card upgrade) the time taken to calculate a route has increased significantly (and I've done an exact comparison before anyone asks). Wonder why that is?
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