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PC Usage = Mode4 MicroSD card = !Only!
Tried another card in a 32G variant. Another Sandisk.
Appears slower MODE 4 cards take to PC OS formatting utilities, as recognized as a drive, through a USB adaptor layer. Faster cards, at least those Sandisk offerings I did try, do not. A PC format subsequently causes the card to fail. Write operations to the MICRO SD causes OS to disconnect the USB device, and subsequent attempts to format report back an OS, un-specified error during the format. Sandisk as well provides its own utility to format FAT32. Once the partition has been erased and then recreated, however, their utility is of no help. The drive will be again dismounted. I have not tried the other principle maker among regarded Micro SD quality, the Samsung's EVO series cards. Nor am I sure how and if Mode 4, as a slower, less-technologically advanced product, stands in view of obsolescence. ExFat is big in the handheld scheme of things, including some 32G cards, and exclusive to those above 32G. Hence, Fat32 and the Micro SD format can be asking for trouble. I paid, BTW, a couple bucks more, w/ state taxes, for a local retailer, for the ease and comfort of having my money returned. I then subjected the 32G card to PC Format Hell, which it passed with neither minor, questionable, nor glaring major issues. (Which is good for Sandisk. . . I intended to format and disable every model on store sales rack, otherwise, until either I'd exausted them all, or found one which functions properly, not only with Sandisk's so-called FAT32, but the proper PC definition and implementation of FAT32.) |
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PC Usage = Mode4 MicroSD card = !Only!
On Sat, 17 Dec 2016 02:16:02 -0500, Flasherly
wrote: .... but the proper PC definition and implementation of FAT32.) - I had to belabor that. An MP3's app-specific, handheld's ROM, which I need to read by both blocks (floating-gate NAND 4K-page addressing), so as to correspond both sequentially and physically. There however occurs SD NAND block-erasure issues, particular to the app-device, so as not to be able account for subsequent page erasures. Proper re-addressable alignment of data added (read on a page bases from erased entries on a block basis) is not possible. The solution -- possibly due to the app-device's lack of a MMU's (Memory Management Unit) virtual extension to RAM overlays -- for correct alignment to any changed file pointers is implementation of a FAT32 format routine;- the reciprocal partition, beneath the file system, need not be removed (and re-initiated). The buffer writes, ordered prior on a PC for files being sent to the card's NAND, are newly laid in fresh page alignment for correct app-device ROM bus addressing the NAND controller. Altogether, I couldn't imagine this is anywhere near an inconvenience involved for most any other handheld to be successfully marketed. An equivalence for SD storage considerations -- SD suffices to approximate by some handhelds for embedding augmented programs -- to a corrupted HDD requiring a reformat every time a program or other data is added to storage. An overhead involved, as it were, in apprising numerically from a 15-entry keypad an odd 10K of discrete MP3 entries. Without a web service subscription or the extraneousness usually associated with devices near in size to a deck of cards. One of those things that pops up occasionally within a vague framework of uniquely intuitive Chinese conceptions. |
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