Advertisement

There's no such thing as a stupid question, but they're the easiest to answer.
Login
Search

Advertisement

Hardware Hardware
Search Search
Search for:
Tech Support Guy > > >

sd card gets an I/O error


(!)

roshamboe's Avatar
roshamboe roshamboe is offline roshamboe has a Profile Picture
Member with 151 posts.
THREAD STARTER
 
Join Date: Nov 2008
Experience: Intermediate
07-Aug-2009, 02:55 PM #1
sd card gets an I/O error
im not sure if i posted this in the right place, please forgive me if i didnt but i recently bought a PNY 4gb Micro sd card. when i put inside my computer, and go to my computer and click to open drive F, i get a message that says,
"F:\ is not accessible"
"The request could not be performed because of an I/O device error"
i dont have a seperate adapter to use my card, there is already one built into my desktop computer but i openint it on my cousins computer and it worked fine.
ruggb's Avatar
ruggb ruggb is offline
Computer Specs
Member with 177 posts.
 
Join Date: Aug 2009
Experience: Advanced
08-Aug-2009, 12:17 AM #2
4GB is an SDHC card. your card slot sounds like it is not HC compatible.

Warning: some card readers advertised as being HC compatible are not.
that is from experience.
roshamboe's Avatar
roshamboe roshamboe is offline roshamboe has a Profile Picture
Member with 151 posts.
THREAD STARTER
 
Join Date: Nov 2008
Experience: Intermediate
09-Aug-2009, 01:00 AM #3
thanks
thanks for the reply, but i tried my friends 2gb sd card and it worked fine, what makes them different besides the size? and is there any way i can make my card slot HC compatible?
ruggb's Avatar
ruggb ruggb is offline
Computer Specs
Member with 177 posts.
 
Join Date: Aug 2009
Experience: Advanced
09-Aug-2009, 09:45 AM #4
A 2 GB card is NOT HC
A 4GB card IS HC.

HC incompatibility appears to be the issue.
I need to research that, there must be another address line to access the higher memory.

I don't think u can make non-HC compatible into compatible.
Unless the mfg has a software fix.
adapter cards do not.
I am not sure what the actual difference is but it is probably the address line.
adapter readers are cheap, BUT not all readers advertised as HC compatible actually are.

If u buy one and it doesn't work with 4GB but does with 2GB (as it does now) the reader has the same issue.
ruggb's Avatar
ruggb ruggb is offline
Computer Specs
Member with 177 posts.
 
Join Date: Aug 2009
Experience: Advanced
09-Aug-2009, 10:39 AM #5
this is some of what makes them different. It is a software function to be able to read different sizes.

most readers appear to have the firmware burned into them and can't be changed.

========================================



Devices that use SD cards identify the card by requesting a 128-bit identification string from the card. For standard-capacity SD cards, 12 of the bits are used to identify the number of memory clusters (ranging from 1 to 4096) and 3 of the bits are used to identify the number of blocks per cluster (which decode to 4, 8, 16, 32, 64, 128, 256 or 512 blocks per cluster).
In older 1.x implementations the standard capacity block was exactly 512 bytes. This gives 4096 x 512 x 512 = 1 gigabyte of storage memory. A later revision of the 1.x standard allowed a 4-bit field to indicate 1024 or 2048 bytes per block instead, yielding more than 1 gigabyte of memory storage. Devices designed before this change may incorrectly identify such cards, usually by misidentifying a card with lower capacity than is the case by assuming 512 bytes per block rather than 1024 or 2048.
For the new SDHC high capacity card (2.0) implementation, 22 bits of the identification string are used to indicate the memory size in increments of 512 KBytes. Currently 16 of the 22 bits are allowed to be used, giving a maximum size of 32 GB. All SDHC 4-GB and larger cards must be 2.0 implementations. Two bits that were previously reserved and fixed at 0 are now used for identifying the type of card, 0=standard, 1=HC, 2=reserved, 3=reserved. Non-HC devices are not programmed to read this code and therefore cannot correctly read the identification of the card.
All SDHC readers work with standard SD cards.
roshamboe's Avatar
roshamboe roshamboe is offline roshamboe has a Profile Picture
Member with 151 posts.
THREAD STARTER
 
Join Date: Nov 2008
Experience: Intermediate
11-Aug-2009, 06:28 PM #6
k
ok ill just get a seperate card reader off ebay for 2 bucks, thanks
ruggb's Avatar
ruggb ruggb is offline
Computer Specs
Member with 177 posts.
 
Join Date: Aug 2009
Experience: Advanced
11-Aug-2009, 08:34 PM #7
buyer beware.

the box may be labeled HC compatible, but that is not a guarantee that it is.
I bought 3 from dealextreme and the blue one was not.
the black "All-In-One" with a cable and a memory stick style one are fine, though the cable was bad on the AIO.

A micro card reader for Ebay for 25 cents worked fine also.
As Seen On

BBC, Reader's Digest, PC Magazine, Today Show, Money Magazine
WELCOME TO TECH SUPPORT GUY!

Are you looking for the solution to your computer problem? Join our site today to ask your question. This site is completely free -- paid for by advertisers and donations.

If you're not already familiar with forums, watch our Welcome Guide to get started.


(clock)
THIS THREAD HAS EXPIRED.
Are you having the same problem? We have volunteers ready to answer your question, but first you'll have to join for free. Need help getting started? Check out our Welcome Guide.

Search Tech Support Guy

Find the solution to your
computer problem!




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools


WELCOME
You Are Using: Server ID
Trusted Website Back to the Top ↑