Also this is the main purpose of "Scandisk" with the repair option turned on. Most other bad spots on a disk will be flagged as "Not Usable" when you format a disk. This is why a disk cannot be fixed that has a damaged MBR (Master boot record). The serial number is located at the bottom of the memory card.The first ten digits at the bottom of the memory card represent the serial number of the. I use to use one to create a catalog of what programs were on my disks just by insertting them into the drive via a "MS Basic program". ![]() It is programmed during card manufacturing and cannot be changed by SD Card hosts. ![]() Since using windows I have lost interest in these type of utilies but I believe they are still out there. The CID register is 16 bytes long and contains a unique card identification number. I believe all medias are assigned a s/n by the format process when they are formatted. Ultra High Speed (UHS) The Ultra High Speed (UHS) bus is available on some SDHC and SDXC cards. High Speed Mode (25 MB/s) was introduced to support digital cameras with 1.10 spec version. ![]() ![]() These areas are not reachable via the regular explorer access. SD Cards will read and write at speeds of 12.5 MB/s. These areas also contain info such as media type, manufacturer etc. Back in my earlier days of computing (the 80's) there were DOS utilies that could access the areas (sectors and clusters) reserved on a media for such things as FAT tables and table logs of bad spots on a disk whether it be a floppy or harddrive.
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