Database Users

HD2 destroyed my SD card?

Hello.
After trying the android booting, for 5-6'th time (all working), now the phone can't see the SD card. I thought it was only on the phone, but when i insert the card, in adapter and connect to pc, then NOTHING happens. Like if the card wasn't there.. Hmm, any clue? Usually I just formatted. But now, I can't format a SD card which "isn't there."
Please.

any one??? :S

mooooooa said:
Hello.
After trying the android booting, for 5-6'th time (all working), now the phone can't see the SD card. I thought it was only on the phone, but when i insert the card, in adapter and connect to pc, then NOTHING happens. Like if the card wasn't there.. Hmm, any clue? Usually I just formatted. But now, I can't format a SD card which "isn't there."
Please.
Click to expand...
Click to collapse
Sounds like your sd card maybe corrupt, they can die for no apparent reason, its happen to me twice in about 4yrs, tho i always buy from CEX they offer a 1yr warranty & just replace it if its within that time.
There's been a few threads about this;
http://forum.xda-developers.com/showthread.php?t=712281
http://forum.xda-developers.com/showthread.php?t=646731

Which brand?
mooooooa said:
Hello.
After trying the android booting, for 5-6'th time (all working), now the phone can't see the SD card. I thought it was only on the phone, but when i insert the card, in adapter and connect to pc, then NOTHING happens. Like if the card wasn't there.. Hmm, any clue? Usually I just formatted. But now, I can't format a SD card which "isn't there."
Please.
Click to expand...
Click to collapse
What is the brand of the memory card?

hey dude,i got the same problem as yours few days ago..cant do much abt it,i just buy a new one..some says the htc that makes the sd card problem

Hi,
My 8 GB sd card lags when i`m scrolling in the file manager.
In addition, the sd card drains the HD2 battery. I loose 35% in 6 hours in flight mode, but only 4% when not in flight mode without the sd card... ( this also yields for the original sandisk 2 GB sd card that was supplied with the phone).
Anyone experienced the same issue?
Is this hardware or software related, and can i fix this myself?

Error check your microSD card using your computer then switch your phone off, put the card back in it and switch your phone back on. The phone will need to index your music/video files etc so go to the relevant tabs and let it do its stuff. See how that helps.

mooooooa said:
Hello.
After trying the android booting, for 5-6'th time (all working), now the phone can't see the SD card. I thought it was only on the phone, but when i insert the card, in adapter and connect to pc, then NOTHING happens. Like if the card wasn't there.. Hmm, any clue? Usually I just formatted. But now, I can't format a SD card which "isn't there."
Please.
Click to expand...
Click to collapse
i got a new HD2 and it came with a MicroSD card. I put a couple of cooked ROMs on it and everything was fine for about a week and then the card jsut stopped working. I didnot use it on any other phone or on my PC and it just died.
I own an HTC Hero as well and i put the card in it but it wouldnt recognize it. It has never happened to me before. Never has a card died on me.
I think its a problem with the way the HD2 accesses the SDcard. I wouldnt know specifics but this is the first phone that fried my SD card.

Hey guys, I had the same issue. The SD card stopped working and cannot be formatted now via computer.

My experience with Windows Mobile is that the SD/CF driver is the weakest link. The problem seems to be simultaneous accesses drive it bonkers. I've had the disappearing card problem on other PDAs but usually removing it, doing a reboot with it out, and then inserting it after the reboot is complete will fix it. If it doesn't show up immediately DON'T do anything for a while, it could be doing a CHKDSK on the card, and if you mess with it it will screw it up worse.
Once it shows up what I would recommend is hooking up via USB in CF Disk mode (not Activesync) and doing a format on the drive from Windows.
Last night I got a new 32gb Class 4 MicroSD from China (unnamed) and stuck it in, worked fine, so I backed up all my data to my 'puter off the T-Mobile Class 2 16gb and changed to the new 32gb SD. I started the copy and after a while went to bed.
This morning I got up and it had died during the copy. It was giving me an error on the new MicroSD. It had copied about 75% but was asking to continue or skip. I ended up having to cancel it because it appeared full but it was not. After a reboot I found a ton of FILEXXX.CHK files which indicated it was doing a chkdsk.
Looking at it with SoftWinter.com's Storage Tools the disk was formatted with 512 byte cluster size, way too small for such a large disk, so it was not really out of space just out of cluster nodes. If you have lots of files (I had 10,000) each takes up at least one, even if the file is only 5 bytes. So I reformatted it from the 'puter to 32k cluster size and started the copy over. Seems to be working better now.
Please note that using larger cluster size also will help performance when writing and reading large files as it has to do less directory accesses. Small cluster size is good if you have a lot of small files as it doesn't waste as much space. You lose on average 1/2 the cluster size for each file, as the last node is almost never full.

mknewman said:
My experience with Windows Mobile is that the SD/CF driver is the weakest link. The problem seems to be simultaneous accesses drive it bonkers. I've had the disappearing card problem on other PDAs but usually removing it, doing a reboot with it out, and then inserting it after the reboot is complete will fix it. If it doesn't show up immediately DON'T do anything for a while, it could be doing a CHKDSK on the card, and if you mess with it it will screw it up worse.
Once it shows up what I would recommend is hooking up via USB in CF Disk mode (not Activesync) and doing a format on the drive from Windows.
Last night I got a new 32gb Class 4 MicroSD from China (unnamed) and stuck it in, worked fine, so I backed up all my data to my 'puter off the T-Mobile Class 2 16gb and changed to the new 32gb SD. I started the copy and after a while went to bed.
This morning I got up and it had died during the copy. It was giving me an error on the new MicroSD. It had copied about 75% but was asking to continue or skip. I ended up having to cancel it because it appeared full but it was not. After a reboot I found a ton of FILEXXX.CHK files which indicated it was doing a chkdsk.
Looking at it with SoftWinter.com's Storage Tools the disk was formatted with 512 byte cluster size, way too small for such a large disk, so it was not really out of space just out of cluster nodes. If you have lots of files (I had 10,000) each takes up at least one, even if the file is only 5 bytes. So I reformatted it from the 'puter to 32k cluster size and started the copy over. Seems to be working better now.
Please note that using larger cluster size also will help performance when writing and reading large files as it has to do less directory accesses. Small cluster size is good if you have a lot of small files as it doesn't waste as much space. You lose on average 1/2 the cluster size for each file, as the last node is almost never full.
Click to expand...
Click to collapse
Hey
i hope for your sake im wrong, but as far as ive been able to find out in my own searching, only san disk has released a 32gb micro sd & its only class 2.
there has been a lot of talk of fake 32gb micro sd's from china, most are actually 4gb re-programed to read as 32gb on your phone or pc, but when you start to fill them with files more than their actual capacity they will only overwrite prev' files & become corrupt.
i actually pick up 1 (32gb) last weekend from a local store, tried to copy the contents of my 16gb, 7gb copied then an error occurred, 2nd attempt 9gb copied but files unreadable by phone or pc, fortunately i always buy from this store & they refunded (£50), straight away, still have 2 16gb cards ive had for about 9mnths with no probs.
there is another longer thread over in the Q&A section, you guys may find some useful feed back over there: http://forum.xda-developers.com/showthread.php?t=646731

Well, the one I got says SanDisk and I have done a full format and surface analysis, it checks out, but I am having trouble writing to it. Not sure what is up with it right now. I knew it was a fake but I thought it was a real fake, not a piece of junk. I hope you are wrong.

I´ve got problems too. I have two SanDisk 16 GB microSDHC cards and both of them are giving similar problems.
I´ve got my HD2 a few days ago and initially I used my old 16 GB card I bought with the X1 (then used with my TP2 and latest the HD2). Everything was working fine initially but then the problems arose. Now I have those problems:
1. Audio Manager has problems reading my music library. iPlay can read it though. Windows Media Player takes a long time building my music library but manages to do that eventually.
2. HTC Album can read my albums sometimes - sometimes not.
3. Resco Photo Manager can read the albums but sometimes it takes a long time to do it.
4. The computer can access the card without any problems after formatting and it seems not to be any problems reading or writing files to it. Installations of cabs stored on the memory card works.
5. Total Commander can access the card without any problems but takes slightly longer time than before to show all folders.
6. Running chkdsk in Windows gives the result of a perfectly working card.
7. The phone is draining battery in an abnormal way with the card inserted.
8. Flashing ROMs from the card worked initially but not any longer. Now it shows the threecolor bootloader screen instead.
The interesting thing is the fact both of my 16 GB cards has the exactly the same symptoms. I will try them in my X1, TP2 and Vivaz later to check out their behaviour.
When I inserts my old 8 GB card (everything made by SanDisk) everything works without any problems. Flashing ROMs work normally etc.
I´m running the Omega XT 3.0 and are using HardSPL3. The 16 GB card has worked perfectly initially with this ROM and HSPL so I don´t think they are related.
The whole thing seems to indicate some kind of "incompatibility" between the phone and the 16 GB cards. It´s like it is unable to handle that size of card correctly. It seems like it "trashes" the file system. My older 16 GB card started to behave badly which caused me to buy a replacement and now that replacement has the exactly the same behaviour.
My 8 GB card is an "ultra" SanDisk card. The troublesome cards are Class 2 cards. I began to have the impression the problem is some kind of issue with Class 2 - because the cards itself seems to be working after formatting.
I have formatted them with either Panasonic SDFormatter and the Format SD application on the phone. Both options gives the same result.

SD Card is Damaged. Try Reformatting it.

Anyone else getting this with their S4? I bought my S4 two weeks ago and a Sandisk 64gb card to go with it and started seeing this error about twice a day. I returned it for a Samsung SD and didn't see the error for almost a week until today.
The card actually appears to be fine, all I have to do is remount it after seeing the message and all is good, it's just worrisome cause I store all my photos on there. I'm wondering if it could be the phone itself? I have one day left to exchange it, but it's rooted.

SD Errors are because the card is physically moving when its being written to. This cause bad sectors on the card. Try putting a piece of thin scotch tape and cut to shape of the face of the SD Card. See if it fits more snug....
Are you jogging with the S4 or something? Samsung SD's are class 10 which I think write faster. Maybe that is less likely to cause damage because its written so fast? Not sure....
Try the tape trick and see if it reduces the problem. Else its a physical problem with the slot.

i also have a class 10 64gb, some guy on the forum posted this problem too, he said that by formating the card with a PC and then formating it with the format utility in the phone settings has solved his problem. If not, might be a slot problem like slider mentionned

I had this problem too with my 32 gig class 10. When I put my shock absorbant case on it my problem went away
Sent from my SAMSUNG-SGH-I337

I had never had an issue with a Sandisk card until my S3 ate a 32GB. I then started readibg how the S3 ate non- Samsung cards. I have been using a Samsung card with no issues

hope you make regular sdcard backups and copy to pc
polish_pat is correct, reformat your card with sdformatter, use Full Erase On and Size Adjustment On
Of course backup first
you shouldn't have to reformat again in phone--
if the card is good this should solve your issue

I had tried 3 different San disk 64GBP class 10 cards and had this problem, the fourth one works so far...doing some searching I found lots of complaints from lots of different device forums about this card. Only fix I found was running chkdsk repair on the card in Windows but this only worked for a few people ( couldn't save my first three cards)
anyway, imo exchange the card or better yet buy a different brand
Sent from my SAMSUNG-SGH-I337 using xda premium

Posting here as doing a search revealed this is the closest to the problem that I'm having. I've had my AT&T Samsung Galaxy S4 for approximately 1 month now. I purchased a Sandisk 32GB SD Card for the phone. Two days ago I began experiencing issues where when unlocking the phone I would notice the card would unmount then remount (this was in the notification bar). Later that night, the card unmounted and there wasn't any way to get it recognized again. I posted in some other forums and someone said there were some good posts here.
I've contacted Sandisk regarding the card and they refused any involvement stating it's a problem with the phone, not the card. They determined this because once I was able to get the phone to recognize the card and plugged the phone into the PC, the card was able to be read. As long as it's readable, it's fine. After dealing with this I eventually found my MicroSD to SD reader and plugged it into my media reader in my printer. I had quite a few issues from time to time reading the card, however I can't 100% for sure say whether this is the card or the printer.
Anywho, I grabbed copies of what I needed. Formatted the card on the PC, then formatted it on the phone. I began to copy my entries however at one point instead of saying I had 29.* GB Available, it said something like 2.0 EV of 3.0 PE or something like that... these weren't the typical numbers I've seen nor the units of storage space. I apologize that I can't recall that information. I reformatted again and it worked. Left the card in the phone empty over night then tried to copy files later today. This worked.
Now, approximately 48 hours after the problems began, I noticed more issues. SD card stated that it had been damaged and that I should reformat it. While this message stayed in notifications, I confirmed I was still able to read files on the SD card. When googling that error hoping I'd find more resources, the card again unmounted.
One of the resources I found had me do a CHKDSK /F /X on the card. I did this and found no issues. I've replaced it back into the phone and it seems to be working for the moment.
1) Are there any confirmations if this is a bad card, or if perhaps any applications are causing the card to do this? I do have QuickPic and have enabled some of the hidden file features if that helps.
2) Do we know if there are any logs that can be pulled to help verify this?
3) Is it a specific card? (I've heard SanDisk 32gb, but also have heard non-Samsung SD will fail)
Looking to get this resolved ASAP. This card was purchased directly from AT&T when the phone was purchased. I am just looking for some confirmation that if I have to buy another card, I'm not going to gamble if that's going to have the problem as well.
Thanks! If I forgot anything please ask!
Edit: Per the thread, this is a Class 4 card. Also the phone was not moving when it was writing data. I've been couch-ridden all day and unlocked it. I don't believe the phone was in deep-sleep mode as I had received a text not long before I began noticing these messages.

same problem
i have the same problem and guess what ?
the phone is acting like the ***** it stays ok for 3 weeks while that time i download to many stuff to my ext card 32g Elixir Memory after that it crach and give me notification that sd card is damaged and i have to reformat it sucks
by the ****in way this's the fifth time it crash i changed the memory to sony and same and changed to Kodak and the same
so abso****inlotley its the S3 for me soon its going to trash

polish_pat said:
i also have a class 10 64gb, some guy on the forum posted this problem too, he said that by formating the card with a PC and then formating it with the format utility in the phone settings has solved his problem. If not, might be a slot problem like slider mentionned
Click to expand...
Click to collapse
This works! It fixed the issue I was having with my SanDisk 64GB.

sd card corrupting

Hi,
I have a new 64gb class 10 sd card. It seems that it keeps on corrupting at some point inside my note 3. Most of my music has corrupted and photos i take become corrupted. Im pretty sure if i do a dskchk on pc it recovers them all but i dont have my pc with me now for another 4 weeks. Does anyone know why this is happenning? Ive reformatted the cards several times now its fat32.
The note is unrooter stock and its the first time ive had an sd in it.
Thankss

Are you sure it is an official card and not a fake? There are cheap cards out there that claim to have large capacity (and show as such when you insert them), but in fact they are actually hacked low end small capacity cards... As soon as you go over its actual size, files get corrupted.

gschot said:
Are you sure it is an official card and not a fake? There are cheap cards out there that claim to have large capacity (and show as such when you insert them), but in fact they are actually hacked low end small capacity cards... As soon as you go over its actual size, files get corrupted.
Click to expand...
Click to collapse
Thanks for the reply, how can i check it? I have the unrooted phone itself i dont have a laptop or computer at the moment

There are test tools, but the ones I know of run on pc. One indication of a fake card could be if it was offered online for a ridiculous low price.

Search SD card tools on Google play store, there are apps that can verify its authenticity but like gschot said, PC tools like H2testw are the best and most reliable.

ddogishere said:
Search SD card tools on Google play store, there are apps that can verify its authenticity but like gschot said, PC tools like H2testw are the best and most reliable.
Click to expand...
Click to collapse
Thanks i will try that.
What i can say though is that when i used the pc to copy music over using the sd adapter the computer did it fine. I could play it no problem, then when i put it in my phone things became strange so i put it back into the computer which noticed a problem and suggested a scan. After scanning the files appeared again. I formatted the card to fat32 again and recopied all the music before i left, and 16gb of music has been reduced to 7.5bg of music through corruption. The phone doesnt tell me that they are corrupted. The folders are there with the first letters of the title changef to a μ symbol. E.g. DCIM folder changes to μCIM and the folder will be empty.

The sd card tester dont work because kitkat doesnt let apps write to the sd card. :L

supasye said:
The sd card tester dont work because kitkat doesnt let apps write to the sd card. :L
Click to expand...
Click to collapse
The ~7gb after scanning almost confirms that it's a 8gb card. Format it again & put less than 7gb of files on it and see if will be OK.

There's several threads in the Q&A section...have a read at my posts.
http://forum.xda-developers.com/galaxy-note-3/help/note-3-self-deleting-files-sd-card-t2852399
http://forum.xda-developers.com/showpost.php?p=54068881&postcount=8

Strange external micro SD card problem with Moto X Pure 1575, please help!

Similar issue like in this post:
http://forum.xda-developers.com/moto-x-style/help/sd-card-problems-moto-x-pure-t3447789
But even worse. The external SD card suddenly vanishes from phone, now it only shows up shortly after phone re-starts, then the external SD card will disappear again. Don't know what's wrong. Then I put a new SD card, it happens like that after I used it for two days. The external SD card is used as portable storage.
When I tried to format the SD card when phone just started, it fails to do so, then it disappears.
I took both SD cards to Windows computer, they show up correctly and I can copy the files out from them. However, I cannot format them, they give out error: the exFAT card is writable protected. How a micro-SD card is locked for writing?
Tried to search online, but couldn't figure out how to solve the issue. It seems to me the phone has some issue with the card and changed the card somehow.
Can anyone help?
Thanks a lot!

I've had similar issues with SD cards that were going bad - weird, inconsistent behavior. Do you have another SD card you can test the phone with to confirm it isn't a rom or tray problem?
I once had a card that would work fine in TWRP, fine in a PC w/ adapter, but just show up as removed and added over and over again in a rom. Had another that could be read, but not written or formatted. It was full of music, but music players could only play about 5 seconds then they'd skip to the next song. Both of these cards failed in short order after starting this flaky behavior.
Based on my experience, I'd say recover your data and RMA if it is an option. Having microSD to supplement storage is convenient, but those things are cheap for a reason.

jason2678 said:
I've had similar issues with SD cards that were going bad - weird, inconsistent behavior. Do you have another SD card you can test the phone with to confirm it isn't a rom or tray problem?
I once had a card that would work fine in TWRP, fine in a PC w/ adapter, but just show up as removed and added over and over again in a rom. Had another that could be read, but not written or formatted. It was full of music, but music players could only play about 5 seconds then they'd skip to the next song. Both of these cards failed in short order after starting this flaky behavior.
Based on my experience, I'd say recover your data and RMA if it is an option. Having microSD to supplement storage is convenient, but those things are cheap for a reason.
Click to expand...
Click to collapse
Thanks, I've tried the second one(which works perfectly before I put in the phone) already, it ends up as the same bad state. I am afraid to brick the third SD card I throw into there...but I will try another one later.

I should have read more carefully. I wouldn't throw a third card at it if you've already tried two and had the same result.
Is this with the stock rom?

jason2678 said:
I should have read more carefully. I wouldn't throw a third card at it if you've already tried two and had the same result.
Is this with the stock rom?
Click to expand...
Click to collapse
Yes, stock ROM, but I did root the phone.
I tried to contact Moto support and request a repair, funny enough it didn't go through because I don't have US address, which I did and put it right there!
For test, I put another small capacity card in the phone again to see what's going to happen...It might be the card, but two cards in a row...and they are different brand...Anyway, Lexar card will replace my card without trouble. But I still want to know if it's the phone's problem...Will see.

cr2069 said:
Yes, stock ROM, but I did root the phone.
I tried to contact Moto support and request a repair, funny enough it didn't go through because I don't have US address, which I did and put it right there!
For test, I put another small capacity card in the phone again to see what's going to happen...It might be the card, but two cards in a row...and they are different brand...Anyway, Lexar card will replace my card without trouble. But I still want to know if it's the phone's problem...Will see.
Click to expand...
Click to collapse
Be interesting to see if the small card behaves. If it is <32 gb it is probably fat32.
Some of the problems I described above started after letting an old phone format a high capacity card that started out as exfat to fat32. Some people say they do it and it is not a problem, but I tried formatting one 64 gb card from exfat to fat32 and broke it twice. Once using a phone and the second time using a laptop and gparted. Manufacturer did replace it both times. Left as exfat I'm still using the same card in my XT1575 several years later.

cr2069 said:
Yes, stock ROM, but I did root the phone.
I tried to contact Moto support and request a repair, funny enough it didn't go through because I don't have US address, which I did and put it right there!
Click to expand...
Click to collapse
Just thought I would chime in and say since you unlocked your bootloader moto legally will not offer a repair unless you pay for it since you're warranty is now null and void.
Sent from my XT1575 using Tapatalk

jason2678 said:
Be interesting to see if the small card behaves. If it is <32 gb it is probably fat32.
Some of the problems I described above started after letting an old phone format a high capacity card that started out as exfat to fat32. Some people say they do it and it is not a problem, but I tried formatting one 64 gb card from exfat to fat32 and broke it twice. Once using a phone and the second time using a laptop and gparted. Manufacturer did replace it both times. Left as exfat I'm still using the same card in my XT1575 several years later.
Click to expand...
Click to collapse
Now I put 4GB card there, it works fine now, need to wait for a few days. My original cards are 64GB, both were formatted as exFAT, now both say being locked fro writing(what...the micro SD card is locked for writing...I want to know how...)

Cdub1976 said:
Just thought I would chime in and say since you unlocked your bootloader moto legally will not offer a repair unless you pay for it since you're warranty is now null and void.
Sent from my XT1575 using Tapatalk
Click to expand...
Click to collapse
Yes, I heard of that, I just did a test drive there and it didn't go through...

SD Card Help 64 GB SanDisk Ultra XC1

Hi all,
I have searched the forum before posting this (know the drill) but can't seem to find a answer to my particular question. And I should probably preface this with, I'm completely new to Android after using iOS for a number of years - wow what an eye opener!
I have purchased this SD Card to use within my Moto G4 -
SanDisk Ultra Micro SD
XC1
64GB
It's red and grey in colour.
I originally set it up as adoptable storage, but since my main use for this was to be able to sync Spotify playlists offline, I had read that internal storage (the old fashioned way) was the way to go. So I used the phone to format the SD card. Now, because of the size, my presumptions were that this was in exFAT format. Regardless of this however, I figured that the best thing was to let the phone handle it.
This however, was causing me issues with "Storage Area Not Found" etc with Spotify - too much information, cut a long story short - I ended up formatting the whole thing in Windows using a 3rd party tool to FAT32. This then seemingly solved the issue, or so I thought.
I'd mentioned this in length on the Spotify forum (thinking that it was Spotify at fault) and the guys on there suggested that I let the phone do it's thing and format the card. However, the camera will give me an error message saying that it couldn't save the image.
So now i'm here - Guys I have no idea how to make this work!
The current situation, I have a 64GB card, formatted by android that (seemingly) every time I turn the phone off, won't be recognised by Spotify or my camera (possibly other apps), unless I unmount and remount it again.
I receive the error message in my camera that the photo can not be saved, and the Storage option in Spotify doesn't appear which indicates that It can't recognise the SD.
Just to be clear, the SD card mounts on boot and is clearly mounted when I navigate to Storage and USB (and when I use ES File Explorer), but something in the background is not telling the other apps that it's there!
ANY ideas on how to set this up properly would be GREATLY appreciated! Thanks for your time reading through this.

Most likely your SD card is broken, I recently bought the same SanDisk 64GB red/gray card and mine is not recognized by the OS. Simply file a RMA with Sandisk and they will send you a new card with a week. These cards have lifetime warranties and remember to backup precious data in multiple location.

carolvityboyz said:
Most likely your SD card is broken, I recently bought the same SanDisk 64GB red/gray card and mine is not recognized by the OS. Simply file a RMA with Sandisk and they will send you a new card with a week. These cards have lifetime warranties and remember to backup precious data in multiple location.
Click to expand...
Click to collapse
Thank for this! I have just filed an RMA so will see what will happen. Does your replacement work ok? If you, did you do anything special to get it working, or just popped it in the phone and off you go?

Did you select to allow the camera/photo viewer app, and spotify, permissions to the sdcard? In newer releases of android every app that requires media extensions must be allowed permission to access the said media. You would have been asked the first time you opened either application.

JKASS5 said:
Did you select to allow the camera/photo viewer app, and spotify, permissions to the sdcard? In newer releases of android every app that requires media extensions must be allowed permission to access the said media. You would have been asked the first time you opened either application.
Click to expand...
Click to collapse
Thanks for the reply mate. Yes I had noticed this, which I think is a great addition to android. Can't believe it wasn't there prior to 6.0, but yes I'd made sure the correct permissions are set.
It seems to be either the SD Card, or something happens with the phone restarts, or goes in to a deep sleep so to speak.

Just to give an update.
I've managed to arrange a replacement card via SanDisk, pretty good customer service - even though it's scripted.
I've subsequently managed to find a 32GB class 10 card I had, formatted it in windows and popped it in - so far so good, so I suspect a dodgy SD card for now. I've heard of manufacturers saying that they support a certain format/size, but in reality the phone/OS struggles!
Thanks for the responses!