Memory SD card and ResMed S9

[thegrons]

Hello;

I was told by the folks at Second Wind that the ResMed S9 has trouble with SD cards larger than 1 gig. So I bought a couple of 1GB cards. Can they handle 4GB or 32GB or is it true that the larger the card the machine doesn't know what to do with the info? Also how many days on average will a 1 GB card hold?

Thanks,

John

[Pugsy]

A 1 GB card will hold well over a years worth of data and then some due to the way the S9 overwrites old data files.
I doubt it will ever get full. I remember checking my S9 VPAP card once after about 6 months of use and I had a 1 GB card and I hadn't even used up 5% of the card.

Don't know where that secondwind got the information about the SD card and the S9 having problems unless they were thinking about those High def SD cards and it's true that some of the older S9's may have had problems with those High Def cards but I don't think it has been a problem in a long time. For sure 4 and 8 GB SD cards have been used without issue.

[billbolton]

Can they handle 4GB

I'm currently using 4GB cards with no problem in my 3+ year old S9- They were the smallest capacity SD cards I could buy at the local supermarket!

The amount of held data on the card is much smaller than the capacity of even a 1GB SD card. The number of days held depends on the type of data. Summary data is held for ~180 days, detailed data is held for 30 days, and high rate data is held for 7 days.

Cheers,

Bill

[Sheriff Buford]

I can't get 6 months on a memory card. I have always thought it was something wrong with my machine. I buy a new one and in no time, the machine says it can't "read the card".

Sheriff

[FattyMagoo]

I'm testing cards up to 8GB and they are working fine in the S9.

The biggest problem is the machine will reject any card that non-cpap files on it, so if you throw in an old camera card remember to delete all files first.

[Pugsy]

I can't get 6 months on a memory card. I have always thought it was something wrong with my machine. I buy a new one and in no time, the machine says it can't "read the card".

I am thinking this is related to the fact that sometimes the machine rejects the SD card for some unknown reason.
We assume that the file structure has changed somehow but it is hard to prove what may have changed because most of use won't bother going deep into the SD card looking for changes because we don't know how to spot them easily.
It isn't because the SD card is full though and it isn't a problem with the machine. There's a problem with the machine recognizing the SD card contents.
Next time it happens..try erasing or reformatting the SD card with your computer (not the S9) and see if the machine will then accept the SD card.

[StuUnderPressure]

Also how many days on average will a 1 GB card hold?

John

It will NEVER fill up even a 1 GB SD card because of the way the machine overwrites older data.

Also, I do use a 4 Gb SDHC Class 10 in my S9 AutoSet withOUT any problems at all.

[JohnBFisher]

Hello;

I was told by the folks at Second Wind that the ResMed S9 has trouble with SD cards larger than 1 gig. So I bought a couple of 1GB cards. Can they handle 4GB or 32GB or is it true that the larger the card the machine doesn't know what to do with the info? Also how many days on average will a 1 GB card hold?

Thanks,

John

John, it's actually the other way around. The units handle SDHC cards (upto 32GB). However, many computers only handle SD cards (upto 2GB). I suspect the Second Wind folks got the two confused. But to my knowledge (and as others have shown in this forum), the S9 comes with an SDHC card (2 or 4GB in size).

[thegrons]

So if my sd cards are no sdhc they won't work? Should I buy a 4gb sdhc instead of f2f he 1gb hd cards I have bought?

[Pugsy]

So if my sd cards are no sdhc they won't work? Should I buy a 4gb sdhc instead of f2f he 1gb hd cards I have bought?

No need to buy anything else....your plain SD card will work just fine and the 2 one GB cards are more than plenty for what you will ever need.

Plain SD cards have always worked...a while back the SDHC cards sometimes wouldn't work on the earlier machines but they seem to work just fine now.
I was using a 1 GB plain SD card with my S9 VPAP and after 6 months I still had only used 5% of the space on it.
You will be just fine with what you have already bought.

[avi123]

I use 2 GB SanDisk which costs about $12 at Walgreens, or from Amazon (plus S&H). The problems that I have experienced with these cards don't have to do with the card's capacity but with their quality and the frequency that I stick the cards in and pull out from the XPAP. Those cards can't take many insertions. Their plastic bodies get physically torn around the contact strips by the strong leaf springs inside the XPAPs. Once this happens then the torn card bodies ruin the mating contacts in the Readers for SD cards that I use to connect to my laptop. I am using a Kodak Reader for SD Cards which has a tiny signal light to show flow of electrical current when data moves out from the card. If I don't see this light flickering I could tell then that it's time the discard the SD Card and use a new one. Otherwise, I should be prepared for lots of "bugs" in the software functioning.

[thegrons]

I use 2 GB SanDisk which costs about $12 at Walgreens, or from Amazon (plus S&H). The problems that I have experienced with these cards don't have to do with the card's capacity but with their quality and the frequency that I stick the cards in and pull out from the XPAP. Those cards can't take many insertions. Their plastic bodies get physically torn around the contact strips by the strong leaf springs inside the XPAPs. Once this happens then the torn card bodies ruin the mating contacts in the Readers for SD cards that I use to connect to my laptop. I am using a Kodak Reader for SD Cards which has a tiny signal light to show flow of electrical current when data moves out from the card. If I don't see this light flickering I could tell then that it's time the discard the SD Card and use a new one. Otherwise, I should be prepared for lots of "bugs" in the software functioning.

So the Kodak reader goes into the USB of your computer or does it have an SD interface with the CPAP machine?

[avi123]

I use 2 GB SanDisk which costs about $12 at Walgreens, or from Amazon (plus S&H). The problems that I have experienced with these cards don't have to do with the card's capacity but with their quality and the frequency that I stick the cards in and pull out from the XPAP. Those cards can't take many insertions. Their plastic bodies get physically torn around the contact strips by the strong leaf springs inside the XPAPs. Once this happens then the torn card bodies ruin the mating contacts in the Readers for SD cards that I use to connect to my laptop. I am using a Kodak Reader for SD Cards which has a tiny signal light to show flow of electrical current when data moves out from the card. If I don't see this light flickering I could tell then that it's time the discard the SD Card and use a new one. Otherwise, I should be prepared for lots of "bugs" in the software functioning.

So the Kodak reader goes into the USB of your computer or does it have an SD interface with the CPAP machine?

Reply,

Yes, the Kodak Reader accepts the SD card and goes into the USB in my laptop:


http://www.amazon.com/Kodak-R130-Reader ... r+sd+cards

[JohnBFisher]

Let me use an analogy to explain SD and SDHC cards.

Imagine you have a one dollar bill and a five dollar bill. Imagine you are in front of two vending machines. One of the machines only accepts one dollar bills. The other machine accepts all the way upto a twenty dollar bill. While you can put the five dollar bill into the machine that only accepts a one dollar bill, you don't want to because you might loose the bill - or only get what you would get for one dollar. But you can put the one or five dollar bill into the other vending machine.

That's the same sort of thing with the SD and SDHC cards. They are the same shape. They go into the same slot. But the SDHC cards can hold more data. There are also SDXC cards that can hold even more data that the SD or SDHC cards. You can put any of those cards into an SDXC slot and it will read them. But if the slot only handles upto an SDHC card, then it won't be able to read an SDXC card. If the slot (such as on a computer) can read only an SD card, then it won't be able to read an SDHC or SDXC card.

That's what's known as upward compatibility. You can put the lower level item (the card) into the upper level reader (the slot) without any problem. But you can't put the upper level item (the card) into a lower level item (the slot) and expect it to work.

In your case, you have an SD card. It can be read and written to by your xPAP device, since it can handle upto an SDHC card. And your reader for your computer should be able to handle at least an SD card. If you purchase a reader that can handle a higher level card (an SDHC or SDXC card), then it will still be able to read the SD card.

Hope that helps.

[thegrons]

Thanks John;

Do the SDHC cards sat SD or are they clearly marked as SDHC? To me SD seems to have become a generic term sort of like Xerox was for all copy machines.