Unlike convention hard drives, SSDs contain no moving parts, and significantly reduce latency for data retrieval by behaving more like memory than a disk. They are often used in high-end laptops such as the MacBook Air, gaming PCs, and servers. However, they do use more energy, and have a finite lifespan.

Intel has shifted to a new manufacturing process that provides higher density data storage, compressing more data into chips. Consequently, its costs are lower, and it can pass some of the savings onto customers. A 80GB X series drive now costs 60 percent less than a year ago, and 160GB units are 47% less, according to CNET. The prices are $225 and $440, respectively.

Microsoft’s Windows 7 is optimized for SSD drives, and could help them become more common in mid-range consumer PCs over time. Pricing has been a significant factor in SSD adoption in notebooks, as price increases have wrought a corresponding decrease in sales.

As sales increase, Intel and other memory manufacturers will inevitably reach economies of scale, resulting in further reductions. Affordable, higher capacity SSD drives will arrive; it is just a matter of when.

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SanDisk presumably sees slotMusic (whose site, incidentally, barely mentions SanDisk) as an opportunity to sell millions more flash cards a year. For consumers, though, I’m not sure if the format passes the “why?” test. Here’s SanDisk’s pitch:

“slotMusic cards enable consumers to instantly and easily enjoy music from their favorite artists without being dependent on a PC or internet connection. Users simply insert the slotMusic card into their microSD-enabled mobile phone or MP3 player to hear the music – without passwords, downloading or digital-rights-management interfering with their personal use.”

Okay, so if I’m in Best Buy and see some music that looks irresistible, I can buy it and be listening within moments. If I bought a CD, I’d have to rip and transfer it; if I bought from an online store like iTunes or Rhapsody, I’d have to transfer.

But slotMusic’s instant gratification seems overwhelmed but its downsides, and by upsides of other music formats that it doesn’t have:

–The slotMusic cards are a gigabyte but contain only one album, requiring you to either swap them in and out of your phone each time you listen (clumsy!) or transfer songs off of the card (also clumsy, but in a different way!);

–Owning and managing multiple MicroSD cards sounds like a hassle; many phones aren’t really designed to have you swapping cards frequently, and any card that’s the size of your fingernail will inevitably get lost;

–If I had to choose between a format that offers instant gratification for 29 albums and one that offered slightly-delayed gratification for millions of ‘em, it’s an easy choice;

–When all is said and done, isn’t it more convenient to download music from home then to have to shlep to Best Buy, anyhow?

I’m joining the chorus of conventional wisdom here (here are slams from TechCrunch and GigaOm), which is always dangerous. SanDisk is a smart company–who’d have ever guessed that a memory-card manufacturer would end up in second place to Apple as an MP3 player manufacturer, leaving Sony, Samsung, and Creative in the dust? Then again, its earlier foray into putting content on flash storage, the Fanfare TV service, was a resounding flop, and the company killed it within months of its introduction.

Me, I’m unlikely to pick up any albums on slotMusic until you can buy obscure 1960s bubblegum music on it. And come to think of it, much of the music I buy isn’t available in digital format at all yet.

Here’s my comparison of slotMusic and the good ol’ Compact Disc. And it’s time for a poll:

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