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I have an SDXC compatible SD slot on my laptop that isn't doing anything and I saw a 128gb SDXC for around $150.

I was wondering if this could be use as a secondary hard drive?

If so, what would be performance pros and cons?

How would it compare to a SSD?

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It could be used as a second hard drive, but the SD interface will never have anywhere near the same bandwidth as SATA.

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is there a SATA HD that will fit into the open unused SD slot on my laptop? – Kenneth Jones Jan 4 '12 at 6:34

The SD slot is often a USB device and as such is limited by the speed of that interface as well as the that of the controller . I can see it being used the same way as a very large floppy, but it'll never have the same face melting speed as a proper SSD - the speed is not just the memory type, it is the controller and interface between the computer and storage. I also suspect that SD cards may have less sophisticated wear levelling algorithms than SSD drives andd probably less redundancy (SSDs have spare memory locations to handle wear i believe).

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Actually no, on laptops it's usually a PCI device. – Ignacio Vazquez-Abrams Jan 4 '12 at 8:05

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