The v4 specs show that the cam can support up to a 256K SD card, but the FAQs state that it can support up to a 512K SD card. Does anyone know which is accurate?
Also, do you know approximately how many days of 24/7 recording can be stored on each size card?
First post. Thank you all for your help!
The 256 GB cards have 238 GB of usable space and last about 3 weeks on my V4 cams with continuous 24/7recording. All the cams record a different amount during the same period but 21 days is the average.
One more thing to consider is Wyze Cloud Event Videos auto delete after 14 days. It would be tedious to try to find SD card video older than 14 days unless you knew the exact day and time you want to view.
Welcome to the Forum, @stephenmjoseph! 
When Cam v4 launched, the marketing and product page indicated support for microSD cards up to 512 GB (I think that may have been the first official mention of support for that size of card for a Wyze Cam), but that has since been changed to 256 GB for some reason (I haven’t seen an explanation from Wyze). You can still find references to this in the launch announcement, though what I see in the Help Center lists a 256 GB limit.[1][2]
Looking at a Cam v4 with a 256 GB card set for continuous microSD recording, I see that the timeline begins on 20 February 2026, so I concur with @Antonius’s 3-week assessment. 
I wouldn’t be surprised if 512GB or even 1TB worked fine. But given the cost of memory these days, it is probably way overkill.
Much more important to buy a good brand, endurance rated card. My 128GB Sandisk Pro Endurance cards give me like 9-11 days (depending how much motion, what time of year/how much daylight, etc) set to continuous. I get a bit more in the older 1080P cams but it is pretty close as the v4 uses higher compression to use about the same amount of space.
So far those Pro Endurance cards have been recording 24x7 for 2.5 years non stop. 0 issues, never have to format them, etc.
I just bought 3 different 512 gb cards from China. One was supposed to be really good one. Not one worked. Tried everything. They were $10 each.
But I really don’t think 512s work in them cause it says up to 256 g. On the site.
So I just ordered one 256 and one 128 to try.
Welcome to the Forum, @chopper6t9er!
When Cam v4 launched, its Help Center articles and product page information said that it supported cards up to 512 GB:
That’s from its product launch announcement topic:
I don’t know exactly when or why they changed it to show a max of 256 GB. 
Regarding the cards you bought, I would be highly suspicious for counterfeits with cards claiming that capacity at that price, and I’d be inclined to test the cards with a tool like ValiDrive or something similar.
They can handle 512 fine. As @crease said, they may be counterfeit. Only buy name brand cards from reputable sellers (shipped from/sold by amazon, not 3rd party for example, or direct from the manufacturer). Try to stick with higher end brands like Samsung or Sandisk, or at least mid range ones like Lexar or even the Wyze branded cards (which are probably Lexar, or the somewhat lower end Kioxia). Ideally you want endurance rated cards if continuous recording, but many have gotten away with standard ones.
Also before using them, run them through the formatter from sdcard.org. If you’re sure the cards are legit, you can just do a quick format, but I always do a full overwrite format (takes a while) to ensure there are no problems on the card and it can write the full capacity. This wil also format them to exFAT which is the file system the cams want.
I would not be surprised if they can handle 1TB cards, but not sure if anyone has tried. At that point you’re getting pretty high up in the number of files stored on the card and that could slow the cam down a bit.
I’ve had two 32 gigs ones in my older Wyze cams for a quite a few years. Just ones I had laying around.
Maybe smaller the better? Or their brand name.
Thanks for your help didn’t realize how finicky these can be
If these work I’ll let u know when they arrive in a couple of days but I’m not counting on it lol
Lenovo doesn’t make (or have their own white-label brand) SD cards so those are probably from Ali and are re-labeled from some cheap brand. So test them fully and don’t use them for any critical data.
If anyone is buying non-name brand SD cards, it is wise to check the card with this freeware program called ValiDrive.
I’ve always used h2testw but there are several out there that can accomplish it. Heck just filling the card up with files or even a full overwrite format will do it too.
Of course meeting the advertised capacity is just one hurdle, surviving for more than a few full writes is another (or keeping up with write speed).
Ya I bought 5 different ones from $3 to $6. From Ali
Figured if I could get at least one to work?
All worked for a minute then stopped
And now I can’t even format or partition them on my old Mac
Maybe next time I’ll download those 2 programs n use those instead ?
They still show up but freeze up when I format.
Those programs won’t help if they’re bogus cards, which at that price point and being from Ali, they are.
ValiDrive can only tell you if you bought say a 256GB card but it really only has about half of that storage.
