Generic 1 GB microSD Card

Added to your shopping cart

Do you covet SD cards? One might be tempted to buy the newest, shiniest, largest capacity card simply because it is amazing. For the times when all you need is a simple SD card to get the job done – or a spare to prototype with – this is the card for you. 1GB capacity is plenty to store MP3s or log environmental data, and still dwarves older memory systems like magnetic core memory.

This card is not the Ferrari of SD technology, but thats what makes it perfect to use in permanent projects that require some non-volatile storage. It is a Class 4 SDHC card. This means it is rated to write up to 4 MB/s. A simple test on our PC showed the available space as 942 MB and a write speed of ~5 MB/s.

We do not plan to regularly produce SparkX products so get them while they’re hot!

  • SDHC format
  • 1GB capacity
  • Class 4 (4MB/s)

Customer Comments

  • A couple of little tidbits: the magnetic core memory was a “destructive read” cycle, meaning that the data had to be re-written to the core every time it was read. (The read mechanism was that you’d try to drive the data to a specific value, and if it already was that value, there’d be less impact on the “sense” line than if it was at the opposite value.). The re-write was usually taken care of by the hardware.

    After 10 to 15 years of continuous use, the copper wires would crystalize and the array would fail. (I’m old enough to have used computers with actual core memory.)

    Core memory has the advantage of being. non-volatile, meaning that if you remove power it does NOT autmatically “forget”. (True, the uSD card also has that property, though I’d be inclined to bet on core for “remembering longer”, though it’s very doubtful that anyone reading this comment within a few decades of my posting it will be around to settle the question.)

    The individual cells in the uSD will eventually wear out if written often enough, but again, it’s unlikely that any of us will see that (unless we do something like write an “update” every 10 mS).

Customer Reviews

No reviews yet.