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sifi
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Joined: Nov 19, 2003
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Location: Lincolnshire
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 Posted: Tue Jul 24, 2007 8:53 pm Post subject: Speed of an SD card |
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I need to buy a 512MB (or 1GB card). Tesco have Kingston 512MB for under£10 and 1GB offer at about £12 but no speed is on or in the packaging. The speed recommended on this forum is 50x or greater. How are you supposed to find the speed if it's not stated?
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FazerUK
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Joined: Nov 18, 2004
Posts: 242
Location: Wrexhaml, UK
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| Posted: Tue Jul 24, 2007 11:19 pm Post subject: |
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I found this
1 GB PRT Secure Digital Card ** Lifetime Warranty**66X 10MB/s Read & 9MB/s Write £10 and the GB Kingston SD card is 20p more but does not have speeds on the webpage
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TomTom Go 700,
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Western_Europe-Map v650.1127 |
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sifi
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Joined: Nov 19, 2003
Posts: 125
Location: Lincolnshire
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| Posted: Wed Jul 25, 2007 7:44 am Post subject: |
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| Thanks for looking. |
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sifi
Regular Visitor
Joined: Nov 19, 2003
Posts: 125
Location: Lincolnshire
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| Posted: Wed Jul 25, 2007 9:22 am Post subject: |
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OK I've been looking at some and I realise a good make and fast(ish) will do but which is better between these two 1GB for interest sake?
Integral is 66x and Kingston is 50x
BUT looking at their 'verified performance', the Integral's Read AVG Mb sec (presumably this should be Mb/sec?) is 11.79 and the Kingston's is 17.0. I would have thought for a sat nav that the read time is most important. If I am wrong please tell me.
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vroomfondel
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Joined: May 12, 2006
Posts: 224
Location: Hampshire
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| Posted: Wed Jul 25, 2007 11:16 am Post subject: |
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| sifi wrote: | .... I would have thought for a sat nav that the read time is most important. If I am wrong please tell me.
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Yes its the read speed which is important. Above a certain speed it doesn't make a lot of difference but below it the TT may not work at all or erratically. |
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sifi
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Joined: Nov 19, 2003
Posts: 125
Location: Lincolnshire
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| Posted: Wed Jul 25, 2007 11:55 am Post subject: |
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| Thank you for verifying that. Interesting that the 50x is 'better' than the 66x |
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Wed Jul 25, 2007 1:20 pm Post subject: |
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| sifi wrote: | | Interesting that the 50x is 'better' than the 66x |
Yes, I suspect there is some "creative" marketing going on.
I've been looking on the net for a reliable "benchmark" speed test for memory cards, as there seem to be some outrageous claims, and also a lot of fake "known brand" cards about.... but without much luck, see HERE. |
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Border_Collie
Pocket GPS Verifier
Joined: Feb 01, 2006
Posts: 2543
Location: Rainham, Kent. England.
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| Posted: Wed Jul 25, 2007 2:00 pm Post subject: |
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| The standard Kingston are about 4x read and write. I always use Kingston Ultimate for both my PDA and Digital Camera, which are about 20x read and write. Lifetime guarantee but I've never had a problem with any of them. |
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sifi
Regular Visitor
Joined: Nov 19, 2003
Posts: 125
Location: Lincolnshire
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| Posted: Wed Jul 25, 2007 2:17 pm Post subject: |
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Thanks for the links etc. Quite a minefield.
I got my information for the cards from www.valueimaging.co.uk/1Gb_sd_card.htm
Clicking on the cards gives more information, but whether their 'Performance Verified' values are correct ... ??? |
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vroomfondel
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Location: Hampshire
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Border_Collie
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Joined: Feb 01, 2006
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Location: Rainham, Kent. England.
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| Posted: Wed Jul 25, 2007 3:23 pm Post subject: |
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| Check HERE before deciding. |
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Noobiest
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Joined: Jan 07, 2007
Posts: 57
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| Posted: Wed Jul 25, 2007 4:32 pm Post subject: |
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I will be purchasing another card for my TT One Europe in the next day or so....
Is 1 Gb big enough?
What brands do you guys actually recommend and what speed?
Thanks
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Andy_P
Pocket GPS Moderator
Joined: Jun 04, 2005
Posts: 19991
Location: West and Southwest London
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| Posted: Wed Jul 25, 2007 4:36 pm Post subject: |
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| Lost_Property wrote: | | The standard Kingston are about 4x read and write. I always use Kingston Ultimate for both my PDA and Digital Camera, which are about 20x read and write. Lifetime guarantee but I've never had a problem with any of them. |
Here's where the confusion sets in...
I think the manufacturers aren't using the same numbers. How can a "normal" card be x4, when links like the one just above are showing ordinary (non "turbo") cards with 60x and 133x speeds?
My recommendations:
Anything over x50 (in my language!), or so is fine.
So Kingston and Sandisk "ordinary" cards are fine
512MB is fine for UK only
Europe or multiple maps need 1GB or 2GB
The only rule is avoid cheap rubbish and don't buy a 4GB card unless you have a personal recommendation, as most will NOT work (as they use SDHC technology). |
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Border_Collie
Pocket GPS Verifier
Joined: Feb 01, 2006
Posts: 2543
Location: Rainham, Kent. England.
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| Posted: Wed Jul 25, 2007 4:48 pm Post subject: |
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| Quote: | | Here's where the confusion sets in... |
The real confusion to me oi when they quote e.g. 150x when it fact the read/write is around 20x
The 4x I quoted meant the actual read/write speed, which was at one time shown on the Kingston site for their standard cards.
However, two different cards showing 160x could be different read/write speeds.
A friend suggested some time back that maybe the .e.g. 160x means 160 Mb. Divide by 8 to get 20MB. It appears to work it a lot of cases but not all.
Until it is standardised confusion will reign and I'll stick with Kingston. :D |
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FazerUK
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Joined: Nov 18, 2004
Posts: 242
Location: Wrexhaml, UK
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| Posted: Wed Jul 25, 2007 4:52 pm Post subject: |
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| Noobiest wrote: | I will be purchasing another card for my TT One Europe in the next day or so....
Is 1 Gb big enough?
What brands do you guys actually recommend and what speed?
Thanks |
1GB card with W&E is about 925MB then you will need the tomtom software and the say speed camera's and voice warnings and if you go for the WE&CE that is 1.7GB so you will need at least 2GB card then
_________________
TomTom Go 700,
with External Antenna, External Mike
App v7.160, OS:2324, GPS v1.21, Boot 5.4201
Western_Europe-Map v650.1127 |
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