Max Card size 920

SouthHams · Posted: Thu Oct 16, 2008 10:04 pm Post subject: Max Card size 920

Does anyone know what the maximum external card size is for the 920 as I am about to add a new card after the update to WE Map 810 overflowed the internal card.

DennisN · Posted: Thu Oct 16, 2008 10:30 pm Post subject:

It will accept SDHC cards and they have been used with 8GB SDHC cards (I did use one in mine once). But there's a problem - the device can't write to all of the card (do a search, there's loads of excellent comments on it somewhere), so putting a map on there is not a good idea. Use it for music and pictures and text and stuff, only things you read and don't write to it via the TomTom itself. You may also have problems using that size SDHC card, not all card readers will read/write/format them, so you need to have a reader which will.

I don't use the card any more, because I'm not interested in using the extra "features". I have dealt with the space problem very simply by deleting the maps of Guam (450Kb) and North America (1.4GB). I have of course kept them on my PC's hard disk so I can restore them any time I wish. I have 1.67GB free space.
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

SouthHams · Posted: Thu Oct 16, 2008 11:52 pm Post subject:

Thanks Dennis

As I don't expect to add music I'll take your advice and remove the USA Maps.

I already have a windows backup

dhn · Posted: Fri Oct 17, 2008 12:42 am Post subject:

For what it's worth, a 920 can deal with a 16-gig sdhc card quite nicely as long as you use Explorer and a card reader to put stuff (maps, mp3's, etc. in areas above the first 4 gigs (3.78, actually)
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David

DennisN · Posted: Fri Oct 17, 2008 10:00 am Post subject:

Oh - I didn't pay a lot of attention to the threads elsewhere, David, because I'm not into mp3s and such and now you mention it, I recall they did include 16GB. But I thought "they" said the TomTom can't write to higher than 4GB, so putting maps on there means it can't write whatever it writes in the map folder, particularly updates to the Mapsettings.cfg file?
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

dhn · Posted: Fri Oct 17, 2008 12:12 pm Post subject:

I do know of one individual with a 16 gig sdhc card for his 920 who installed the NA map on his card using Home (so I presume it got written to the lower 4 gig area) and then used Explorer to put 7 gigs (!) of mp3's on the card while the card is in a card reader. So I guess that's how the issue regarding maps, mapsettings.cfg, and not being able to write to grater than 4 gigs all comes together; namely, let Home do its thing with the first 4 gigs on the card.
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David

DennisN · Posted: Fri Oct 17, 2008 11:33 pm Post subject:

Hmm. I'm unreliable in this field, but my understanding is that whether it be Home or Explorer, they start at the "front" or "bottom" of the card and fill it upwards. So if you put say 2 Gb map folder on first, then add 7GB of MP3s (even decent stuff like Black Dyke Mills Band - I confess, I didn't think they'd played that much music), those 7GB will tag on the end of however much space is taken up by the map folder, filling the bottom 9GB of the card without spaces. When Mapsettings.cfg comes along wanting to be rewritten with more data than it already contains, it gets saved to the next free thing (cluster? I dunno what they are, I think of them as parking spaces) and in that case, the next free thing is above 4GB, so TomTom can't write to it. Or is Home so clever it can pseudo partition the card, reserving space for future expansion of Mapsettings.cfg?
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

dhn · Posted: Sat Oct 18, 2008 12:24 am Post subject:

My thinking is exactly like yours, Dennis. But the user I was referring to has not reported any issues.

Listen, I'm still trying to figure out how they get music off a vinyl record! Rolling Eyes

(and I think just the two of us on this forum even KNOW what a vinyl record is ........ or was. Laughing

)
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David

Anita · Posted: Sat Oct 18, 2008 12:43 am Post subject:

DennisN · Posted: Sat Oct 18, 2008 12:45 am Post subject:

That's easy David, I've known for years! They have a sharp thing on a stick which scratches the music off and pushes it along a pipe and it comes out the other end as music. A spider in the pipe catches it after it's been played and sends it back down onto the vinyl disk - otherwise it'd be a ROM (Read Once Mmmm?) disk, not vinyl.
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

DennisN · Posted: Sat Oct 18, 2008 12:46 am Post subject:

Bakelite? (sugar free). We were too poor to have old socks.
_________________
Dennis

If it tastes good - it's fattening.

Two of them are obesiting!!

Anita · Posted: Sat Oct 18, 2008 12:54 am Post subject:

According to Wikipedia they were made of shellac.

But we've taken this thread somewhat Off Topic

Sorry!
_________________
Anita
TomTom VIA 135 - App 12.075
UK map 1130.12368
Samsung Galaxy S21

Andy_P · Posted: Sat Oct 18, 2008 2:27 am Post subject:

Dennis would have had to be really unobservant to sit on shellac CYLINDERS! Razz

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