diff --git a/Computing/Storage/SD/README.md b/Computing/Storage/SD/README.md
new file mode 100644
index 00000000..7371d38f
--- /dev/null
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+All Secure Digital (SD) storage devices contain one or two NAND flash memory chips and a processing unit to manage the operation of the card.
+
+There are three sizes of SD Card permitted by the spcification:
+
+1. original : 1.26 x 0.94 x 0.083 to 0.055 inches
+2. miniSD : 0.85 x 0.79 x 0.055 inches
+3. microSD : 0.56 x 0.43 x 0.039 inches
+
+or, in metric:
+1. original : 32 x 24 x 2.1-1.4 mm
+2. miniSD : 21.5 x 20 x 1.4 mm
+3. microSD : 15 x 11 x 1 mm
+
+Standard SD cards must have with a toggle switch that that permits or blocks write operations on the card.
+The mini and micro sized cards don't offer this feature.
+
+SD cards are available in five storage capacities:
+1. Standard (SDSC): up to 2 GB
+2. High (SDHC): from 2 to 32 GB
+3. Extended (SDXC): from 32 GB to 2 TB
+4. Ultra (SDUC): from 2 TB to 128 TB
+5. Input Output (SDIO): storage with a Bluetooth transciever and/or a GPS receiver
+
+# Storage Formats
+
+* SDSC FAT12, FAT16, and FAT16B.
+* SDHC FAT32 
+* XC/HC exFAT
+
+The exFAT file format was specifically designed for NAND flash devices and is likely to remain the standard for many more years.
diff --git a/Computing/Storage/SD/README.txt b/Computing/Storage/SD/README.txt
new file mode 100644
index 00000000..2a571259
--- /dev/null
+++ b/Computing/Storage/SD/README.txt
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+All SD cards (short for Secure Digital), regardless of their size, use one or two small NAND flash memory chips – similar to those found in USB memory sticks and SSDs – and a tiny processor to manage the flow of data and instructions.
+
+There are 3 standards for the dimensions, and they are incompatible with each other. In other words, a miniSD card reader won't work with microSD cards (unless you use an adapter):
+
+Standard SD cards: 1.26 x 0.94 x 0.083 to 0.055 inches (32 x 24 x 2.1-1.4 mm)
+miniSD cards: 0.85 x 0.79 x 0.055 inches (21.5 x 20 x 1.4 mm)
+microSD cards: 0.56 x 0.43 x 0.039 inches (15 x 11 x 1 mm)S
\ No newline at end of file
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