The new polycarbonate MacBook released today has gained some tantalizing new features, but in the process of redesigning the case to accept the new integrated battery, it's also lost two ports.

Just like the unibody aluminum MacBooks released last year, the latest version of the plastic MacBook has no Firewire port. This also means that the last Firewire 400 port in the Mac lineup has vanished – all new Macs, save the Firewire-free new MacBook, now have Firewire 800 only. Farewell, Firewire 400, we hardly knew ye.

But that's not all that's been lost: in a more puzzling omission, the MacBook has also lost its dedicated audio out port. Now one port does the job of both audio output and input.

I don't imagine the loss of Firewire will go down well with many people (it certainly didn't the last time this happened), but the audio port seems like less of an issue. If you're going to do any serious audio work, you're generally going to want to use a USB peripheral anyway, and having one port do everything makes it impossible to plug your headphones into the wrong port and unintentionally blast your potentially embarrassing iTunes playlist to passersby. Not that that's ever happened to me...

The responses to the blog post were largely in support of my thesis: that losing FireWire from the MacBook is a big deal and a potential (or actual) deal-breaker for many, many users. This was to be expected, as people who are upset about FireWire's disappearance are more likely to respond to an article sharing that sentiment. On Twitter, however, when we just asked, "Is the lack of FireWire on the new unibody MacBook a deal-breaker for you, yes or no?" the data was less skewed.

A majority of the Twitter users that responded to our poll said "no, it is not a deal-breaker." Many commented that the loss is disappointing, but ultimately it won't prevent them from buying a new MacBook. Still, more than one third of the responses were "yes, this is a deal-breaker." Many users are considering putting off upgrading altogether; others expressed discomfort with being forced to buy a MacBook Pro (either the new units, or the now heavily-discounted older units).

A note to concerned future MacBook Pro users: you can get an inexpensive cable with FW400 on one end and FW800 on the other -- no adapter needed, just a new cord for your camera or audio device. Be warned, however, that the presence of a FW400 device in the chain will drop the speed of any FW800 devices to the older standard.

Reader David sent Steve Jobs (or sjobs@apple.com) an e-mail, expressing his disappointment by the lack of FireWire on new MacBooks. The response (which David forwarded and we verified had the correct mail-header information), is pretty interesting...

During the meta-liveblog yesterday, I was in full-out Apple fangirl mode. I won't lie; after the MacBook specs and design were revealed, I was already contemplating putting my current BlackBook (that I bought in August '07) on eBay or Craig's List, hoping that the RAM and hard drive upgrades and all the software I would include could net at least $900. Then I would buy a new MacBook.

After the dust settled and the specs were released, a dark cloud quickly dashed my plans: FireWire 400 ports are no longer included in the redesigned MacBook. The old style MacBook (now selling for $999) still includes FireWire 400, but the new beauties are FireWire free. What a bummer! Back in January, we listed lack of FireWire as one of the biggest downsides of the MacBook Air. On our Talkcast earlier this week, we actually discussed the idea of FireWire being withdrawn from the MacBook line. I thought it was plausible on the then-rumored $800 MacBook (a rumor that never materialized, sadly), but I was really, really hoping it wouldn't be removed from the line as a whole.

Whether the reason was based on user-feedback (which I'm sure Apple will claim), or done merely to force a schism between the "consumer" and "pro" lineups (as commenter Kai Cherry suggested), the net result is that a technology Apple has been pushing for nearly 10 years and that many of us have come to rely on, for external devices, target-disk mode and digital video needs, is no longer available in any laptop other than the MacBook Pro (or the older generation white MacBook).

No company has pushed IEEE-1394 (the technical name for FireWire) more than Apple (though Sony is close). The iPod was a FireWire device until its fifth revision in 2004 (USB adapters were available for the third and fourth generation units). Target Disk Mode is arguably one of the most useful Mac diagnostic tools. As long as you have a FireWire hard drive, you can safely migrate, repair or perform component tests on Mac, without damaging the internal drive.

For those of you who were waiting to buy a Data Robotics Drobo, wait no longer!

Data Robotics announced the release of the second iteration of their 4-bay expandable storage solution, Drobo. Many potential buyers were aghast at the original version's lack of FireWire, so the company added FireWire 800 (FireWire 400 compatible) ports to the original USB 2.0 connection. Transfer speeds with FireWire 800 are expected to be about double those of the USB connection.

The new Drobo also has improved software. The old model would see a drop in performance after the array reached about 50% of capacity. With the new software, performance remains steady regardless of how much data you've packed into your Drobo. Data Robotics says Mac users can expect a performance increase of 10 - 200%.

When new, higher-capacity drives become available, you'll be able to expand the capacity of your Drobo to up to 16 TB. That should be enough to handle all of my TUAW comment email! The second-generation Drobo becomes available in about three weeks, and the original $499 price tag is still in effect for an unpopulated box (no drives included).

Updated to note that no FireWire 400 ports are included. Thanks to Neg and See3Pio for the heads-up!

Do you need a bus-powered 1 TB hard disk? You're in luck - LaCie announced the Little Big Disk Quadra today.

Available in early July, the Little Big Disk Quadra uses a pair of drives in a RAID 0 configuration for speedy response. My personal concern is that if one of the two RAID drives goes out, you'd lose all of the data in the array. Although LaCie states that it's "Compatible with Time Machine", the Little Big Disk Quadra is probably better-suited as a scratch drive for video work on the go.

This is a tiny drive considering the capacity - the outside dimensions are 1.6 x 3.3 x 5.5 in. (40 x 85 x 140 mm) and it tips the scales at 1.4 lbs (650 g). You don't need to use the included AC adapter when using the Little Big Disk Quadra with FireWire 400 or 800, but you will need it when using the drive with eSATA or USB 2.0.

Some sites are stating immediate availability, but LaCie has confirmed that it will be several weeks before the Little Big Disk is available.