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Hardware and Windows Vista Hardware issues in relation to Windows Vista. (microsoft.public.windows.vista.hardware_devices) |
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Generic USB SD Reader
My Gateway computer has Vista Home Premium. My Toshiba laptop has XP. I purchased a Sandisk Ultra II, 2GB to transfer data from my laptop to the Gateway. The data transferred from the laptop to the Sandisk but the computer with Vista does not see the data on the card. I saved a photo from the Vista computer to the card and it shows up with the Vista computer but not in the XP computer. Apparantly the card is fine. What is my problem with Vista vs XP? -- CECarroll1945 |
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Generic USB SD Reader
"Badger" wrote in message ... Did you copy using USB-1 on XP? Did you try to read it with USB-2 on Vista? Or visa versa. To whom are you talking? Please QUOTE the post you are replying to. http://66.39.69.143/goodpost.htm http://www.netmeister.org/news/learn2quote.html Thank you. |
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Generic USB SD Reader
"Badger" wrote in message ... The USB-1 is the normal connector, The USB-2 is an advanced connector. Err no, it's all to do with data transfer speed. And PLEASE - QUOTE the post you are replying to. |
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Generic USB SD Reader
"Badger" wrote in message ... OK, Gordon, I was just trying to save band width. Why you should quote on Usenet.... http://www.netmeister.org/news/learn2quote.html |
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Generic USB SD Reader
From Wikipedia:
Compatibility issues with 2 GB and larger cards 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.[14] Many older devices will not accept the 2 or 4 GB size even though it is in the revised standard. The following statement is from the SD association specification: "To make 2 GByte card, the Maximum Block Length (READ_BL_LEN=WRITE_BL_LEN) shall be set to 1024 bytes. However, the Block Length, set by CMD16, shall be up to 512 bytes to keep consistency with 512 bytes Maximum Block Length cards (Less than and equal 2 Gbyte cards)."[15] [edit] SD (non-SDHC) cards with greater than 1 GB capacity The SD Card Association's current specifications define how a standard SD (non-SDHC) card with more than 1 GB and up to 4 GB capacity should be designed. These cards should be readable in any SD 1.01 devices that take the block length data into account. Any 1 GB or lesser card should always work. (So the key question is how one's reader handles block length). According to the specification,[16] the maximum capacity of a standard SD card is defined by (BLOCKNR x BLOCK_LEN), where BLOCKNR may be (4096 x 512) and BLOCK_LEN may be up to 2048. This allows a capacity of 4 GB. The main problem is that some of the card readers support only a block (aka. sector) size of 512 bytes, so greater than 1 GB non-SDHC cards may cause compatibility difficulties for some users. -- Richard Urban Microsoft MVP Windows Desktop Experience "CECarroll1945" wrote in message ... My Gateway computer has Vista Home Premium. My Toshiba laptop has XP. I purchased a Sandisk Ultra II, 2GB to transfer data from my laptop to the Gateway. The data transferred from the laptop to the Sandisk but the computer with Vista does not see the data on the card. I saved a photo from the Vista computer to the card and it shows up with the Vista computer but not in the XP computer. Apparantly the card is fine. What is my problem with Vista vs XP? -- CECarroll1945 |
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