Memory in a Flash

Flash memory is very useful stuff. It holds the pictures, songs and videos in your camera or portable device. It stores your files on your thumb drive. The best part is, it’s non-volatile, which means it doesn’t need a constant flow of electricity like the RAM in your computer. There are dozens of varieties of flash memory, and I’m not going to describe each of them here, I’m just going to focus on the three most popular.

SD

SD memory, created by memory manufacturer SanDisk, is probably the most common form of flash memory available. The initials stand for Secure Digital, not SanDisk, though. It’s inexpensive, it’s widely available, and it comes in several sizes, including mini and micro, which are more compact forms that fit well into smaller devices like cell phones, which are constantly looking for ways to reduce size.

The original specification for SD cards only worked up to sizes of 2GB. A whole new specification called SDHC, the HC standing for High Capacity expands the amount of memory that SD cards can hold beyond 2GB. Devices created before the new specification was finalized will not be able to use the newer cards. So, be sure your device has SDHC stamped on it, not just SD before you buy a card bigger than 2GB, or you may be disappointed. However, the specification has been in place for several years, so devices that won’t handle the new stuff are getting more and more rare.

Compact Flash

Compact Flash is generally limited to high-end Digital SLR cameras. You don’t find it elsewhere very often. Compact Flash is much larger and heavier in physical size, but it has a significant advantage over SD in speed and capacity, which is why it is popular among high-end camera manufacturers. Just like SD is coming out with new specifications to allow for more memory and speed, CF is also developing new specifications which will allow for better performance. So, it’s important to know what revision number (1.0, 2.0, etc) your camera will handle so you don’t wind up buying a card that won’t work with your camera.

Memory Stick

Sony really likes to be original. They usually wind up doing their own thing and no one else joins in. Memory Stick is a format that only works with Sony devices. It’s the only other format that has any real traction in the marketplace, but no one else seems to be interested in using it. It has gone through several revisions from MS to MS Pro, which offer higher capacity, better speed and smaller size, just like SD and CF.

Shopping around

Finding the right memory for your camera isn’t that hard unless you’re buying memory for old equipment. If your camera is more than 2 years old and you’re buying the largest capacity card you can find, it’s generally a good idea to pull out the manual for your device and compare the specifications it will take with what you’re buying. Either that, or make sure you understand the store’s return policy.

MiniDV

MiniDV, or Miniature Digital Video, was a breakthrough for home video enthusiasts. The format used analog tapes, but encoded a digital signal. This is like the old style modems that sent a digital signal over telephone lines. When it first connected, you heard that series of squeals and beeps that was the sound of digital information being communicated in an audible format. These cameras are all able to transfer video to a computer through a Firewire cable. This technology ushered in the era of desktop video publishing. Software to edit video has become a standard feature for operating systems, and many excellent software video editing packages are available at a reasonable cost.

MiniDV is on the way out as a standard format, and the cameras are starting to get rare in stores. But, no other format has emerged which completely surpasses MiniDV in every respect. Every other format that has come out since MiniDV is also digital, but instead of storing a digital signal on an analog medium, the new formats store a digital signal on a digital medium, like a Hard Drive or Flash Memory. This makes a difference, because analog tapes have way more room for information than a Hard Drive or Flash Memory. That means that MiniDV required very little compression to make things fit. It’s able to store video information that hasn’t been shrunk down to a lower quality. Newer formats, because they have less space to work with, need to compress video down to fit onto a digital medium.

Compressed video isn’t a problem if all you want to do is play the video back. But, if you want to edit the video, then that compression means that you have less raw material to work with. When you apply effects and transitions, a compressed signal is not going to produce as nice a picture as raw video. For most people who just want to capture video of the kids as home movies, this isn’t a serious issue, but if you want to make a short film, you might want to pay attention to how much compression your video camera is putting on the video you capture, and what options the camera has to reduce that level of compression if you want video that is higher quality.

MiniDV tapes can stretch or become caught in the camera mechanism, but on the whole it is still a good option for Standard Definition, because it stores uncompressed video on an inexpensive medium, and the cameras are getting dirt cheap…if you can still find them.

Mini DVD

Mini DVD, which annoyingly has almost the same name as MiniDV, is an all-digital format. DVDs are highly compressed, and the minature discs don’t hold a lot of video. This format is most suitable for those who do not wish to edit video at all. If you primarily want to record and be able to watch the video on your DVD player without having to bother with editing it on a computer, then this might be a good option for you.

The primary drawback of this format is that discs need to be ‘finalized’ before they can be played on a regular DVD player. The process of finalizing a Mini-DVD can take up to twice as long as the recording time. This means that if you shoot an hour of video, it could take the camera as long as two hours after you finish shooting to prepare the DVD for a DVD player. Different cameras do better or worse at cutting this time down, but be aware this can be an issue and read some reviews on the camera before taking the plunge. This format is also on the way out, and while the discs are cheap right now, the cameras are getting rare, and are only available in Standard Definition models.

Hard Drive

Hard Drive video cameras are currently the popular choice. A 30-40 GB Hard Drive will store several hours worth of recording, and offloading it is quick and easy. MiniDV transfers video information in real time. This means that if you want to transfer an hour of video to a computer, it takes an hour to copy it over. Mini DVD takes a long time to finalize a disc. The advantage of a Hard Drive camera is that it stores computer files on a Hard Drive, just like the files you would store on your computer, so when it comes time to transfer from camera to computer, it only takes a few minutes to move those files, just like you were transfering a file from one computer to another. Quick and easy.

The inherent drawback of a Hard Drive camera is that the Hard Drive is sealed inside the camera and you can’t swap it out for another when it gets full. If you’re out shooting for a day or two then returning to your computer, it’s no problem, just offload the files. But, what happens when you go on a two-week vacation? Unless you have a laptop, you might run out of space pretty quick.

The answer is flash memory. When 2GB memory cards were the only reasonably-priced option, buying a dozen of those and swapping them out regularly would be a terrible hassle. But, now that 8 or 16 GB cards are getting into a decent price range, buying several of those cards gives you the flexibility to significantly increase the amount of recording time available on a Hard Drive video camera.

The good thing about Hard Drive cameras is that many of them are available in High Definition formats. This means that they can record in 720 or 1080 resolution. The tricky thing is that the abbreviation for Hard Disk Drive is HDD, and the abbreviation for High Definition is HD. So, there are a lot of letters stamped on the side of one of these units and you need to look closely to see whether it’s a HDD unit, yet only Standard Definition, or both HDD and HD. In order to be able to shoot in HD, a lot of these cameras will significantly compress the image they shoot and often will only offer 1080i resolution (interlaced) which alternates lines of video, not progressive, which displays each line each time. See earlier posts for a further explanation of the difference.

Flash Memory

The next step is to entirely skip the Hard Drive, and only use flash memory. As memory becomes less expensive, this becomes a more attractive option. Without a Hard Drive, the bulk of the unit can be significantly reduced and the power required takes less of a toll on the battery. These cameras can often take High Definition still images, and the line between where Flash Memory camcorders ends and regular Digital Cameras begin blurs a little. This is especially true since some regular Digital Cameras are now offering High Definition video as an option.

If I’m just taking a short video that I want to upload to Facebook or YouTube, then I just use a point-and-shoot Digital Camera. It is able to record at Standard Definition, the video responds reasonably well when I put it into a desktop video editor, and the result is more than enough resolution to look good online. If your job is posting to the Internet, you’ll want a real video camera, but if you’re just having fun, a regular digital camera is really all you need. Some Digital Cameras even come with a ‘YouTube’ mode, which records in the format YouTube uses, to make it easier to upload your videos.

Digital SLRs

Some Digital SLR (Single Lens Reflex) Cameras have begun to offer video. This is a huge development, because the ability to change lenses and control focus directly is really what separates consumer video cameras from professional equipment, and the price difference is HUGE between the two. Now that DSLR makers have started to add in video, they have been able to offer a product that gives amazing control over video shots for thousands of dollars less than professional equipment.

Early DSLR models that offer video do so with some limitations. The units that have just come out tend to overheat if used too long. The auto-focus these cameras use is often designed around taking still pictures and hasn’t yet been optimized to be effective when shooting video, so manual focus tends to be a better option. That manual focus is possible with these cameras is a real positive, but there are times when you just want the camera to do its thing. DSLR Video is still a very new thing, and some of the limitations that currently exist will soon be overcome, but this is a very exciting development and will soon become the must-have tool for those who are serious about shooting amateur video.