USB 3.0's New Jacks and Sockets

The Register has a brief look posted (with photos and diagrams) of "USB 3.0, the upcoming version of the universal add-on standard re-engineered for the HD era, made a small appearance at the Consumer Electronics Show (CES)." The posting explains that USB 3.0 "wasn't demonstrated in operation, but we did get to see what the new connectors look like." How does it handle backward compatibility? The extra pins needed for USB 3.0 "are placed behind the USB 1.1/2.0 ones. USB 3.0 connectors and receptacles will be deeper than the current ones."

Comments

Is it burst speed?

[danomac]

I wonder about the new speed specification... in my experience even with no other devices on the USB bus getting 480mbit was impossible. I always had to resort to firewire for my drive caddy because I got consistent results with it.

I sure hope they've addressed this issue. The OS caching helped, unless you wanted to unplug the damn thing right away - then you had to wait 5 minutes for the cache to flush out.

Re:Is it burst speed?

[gillbates]

Yes, and no.

You see, 480 Mbs is the electrical interface speed. As in, 480 Million bits go across the wire every second. Not all of those bits are used for traffic.

However, some of those bits are used by the overhead of the transfer protocol. You've got USB packets in the stream which do nothing but reserve space for some psuedo-realtime device which might be connected to the bus at any second. Whether or not the OS/USB Controller allocates these blank packets even in cases where they aren't needed is a matter of programming.

As an aside, I've noticed that on the same computer, with the same flash drive, Linux does a much faster job with file transfers than Windows. I suspect Windows is just under-utilizing the bus, to make it easier for their engineers. But I could be wrong, as I haven't looked into it in detail.

Re:Is it burst speed?

[jubei]

Your windows file copy slowness could be because Windows does not use write caching for removable drives. This allows clueless users to just yank out the disk without unmounting properly. If you are getting slow reads, that is a different story.

Re:Is it burst speed?

[letxa2000]

In case a "clueless user" yanks it "without unmounting properly?" Excuse me, but I don't think that's a matter of the user being clueless. If I have a removable drive, I don't think it's unreasonable to be able to remove it at any time--the OS should expect that. If the OS is still writing data to the drive and there's some kind of window open to that effect, then I'm stupid for disconnecting it in the middle of the process. If I "finished" copying three minutes ago, I don't think it's unreasonable for me to be able to disconnect the drive.

This is why Linux is a great OS for a server but not so hot for the desktop. Write-caching for a USB drive might make sense on a server, but not so much on the desktop.

Re:Is it burst speed?

[DaleGlass]

You can disable caching on Linux with -o sync.

However, neither that, nor what Windows does will prevent damage on a FAT32 formatted device, because the filesystem isn't made to deal with that. And even for a filesystem like ext3, reiserfs or ntfs that will not corrupt itself in this case, you'll still lose data if you yank the drive while a file is being written. Windows will warn you if you yank the drive without telling it to disconnect the drive precisely for this reason.

Really the only way of dealing with this perfectly is making the media impossible to disconnect until the filesystem is dismounted orderly. This can be done with CD and tape drives, but isn't going to work with anything connected to an USB port.

Just goes to show...

[Anonymous Coward]

... that longer male connectors are better.

Re:Just goes to show...

[4D6963]

longer male connectors are better.

Nooo it's not how long they are but what they do. Besides if female connectors like long male connectors bigger that's because they themselves are *too* deep. A short male connector fits a "shallow" female connector as nicely as a long male connector fits a deep female connector.

So girls, quit complaining and laughing and get it worked out! Oh wait, oops..

Naming

[teslatug]

So they're going with a 3.0 instead of some crazy More Full Speed (TM) name this time?

Re:Naming

[Brobock]

So they're going with a 3.0 instead of some crazy More Full Speed (TM) name this time?

FTA:
Dubbed SuperSpeed USB, the third major incarnation of the serial bus standard is set to deliver data transfer speeds of around 4.7Gb/s - ten times today's 480Mb/s limit.

They haven't TM'd it yet though.

Re:Then what's the point of SATAII?

[RobFlynn]

I've seen SATAII hubs before.

Here's one that I found with a couple seconds of googling: http://www.cooldrives.com/sahub5muussi.html

Still using rectangular connectors, I see.

[croddy]

p>Whatever they come up with, in the end, I have only one wish for the USB3 hardware developers: that they be made to plug 1000 of them in upside down in the dark.

A serious question

[moosesocks]

What happened to firewire? All signs point to it going extinct in the very near future....

Wasn't it vastly superior to USB? It had a higher maximum throughput that could almost be realistically achieved, delivered useful amounts of power over the bus, and allowed devices to talk to each other. The audio/video features are pretty nice as well....

Both firewire and usb were well-supported on all platforms, so *that*'s not the issue. It's also robust, to the point of being found in many modern aircraft designs and the space shuttle.

IEEE1394c is even cooler, and uses CAT5e/RJ45 for wiring, allowing for automatic negotiation between other 1394 devices, and normal ethernet devices. Max speed is 800mbps, and it very nicely bridges the gap between "traditional" peripherals, and network-attached devices.

So what happened? Did I miss something? Who killed Firewire?

Re:A serious question

[appleguru]

Nobody... The problem with firewire is its cost-- USB is, on the device side, dirt cheap to implement. This comes at the cost of needing a host controller (your computer) to do anything and that comes with CPU use overhead. Firewire requires these 'controllers' in every device, making it far more useful (allowing things such as communication without a computer!), robust, and fast without the overhead. But it costs more! And, as we know, price is what drives the marketplace. As a 'normal' uniformed consumer, would you buy a firewire 400 widget for $100 if the usb version cost $50 and both "did the same thing" and ran at a theoretical "480 mbps" (And we all (by all, I mean us on slashdot) know how well usb2 does that...). As a 'normal' consumer, of course not!

Firewire is far from dead, however... Nearly all consumer/prosumer mini dv cameras use it (including hdv cameras), many set top boxes and HDTVs have 1394 links on them for connecting devices (DVHS decks, HDTVs, and cable boxes... this transport MPEG-2 transport streams), and every mac since the iMac debuted has shipped with firewire ports on it (Many, many external hard drives have firewire ports on them.. the good ones anyways ;))... Sony has been shipping 1394 on its vaio computers for ages (in the form of i.link), and all modern computer manufactures have followed suit.

So, to answer your question, consumers "killed" firewire by being... well... price conscious consumers. But in reality it's not going anywhere, and with any luck and all the cool networking capabilities the firewire spec has these days it will eventually catch on with the majority of consumers as a convenient way to interconnect devices and stick around for good.

Re:A serious question

[DECS]

Microsoft actually supported Firewire before getting USB complete, particularly USB 2.0, where the two standards overlap in certain areas. While Firewire was invented by Apple, Microsoft also actually delivered support for IP over Firewire first (several years first), although I doubt many people used it on Windows because most PCs that have Firewire only have the 4-pin, non-powered version like Sony's iLink. Mini-to-mini Firewire cables are not too common.

Apple didn't support IP over Firewire networking until around 10.3.5 IIRC. Now that it's there, it is actually quite useful on Macs as a secondary network interface, since all modern Macs have FW400 and many now have FW800 too. Macs also have smart enough firmware to use Firewire in Target Mode, which is a significant feature other PCs won't match anytime soon.

The new FW3200 uses the same connector as FW800, an advantage over the different and more complex USB 3.0 connector.

Another advantage of Firewire is that it provides higher voltage for charging, so it can power more significant devices and can recharge devices faster. It's noticiably faster to charge iPods/iPhone over Firewire. The 30-pin Dock Connector has Firewire compatible pins for charging, even though modern iPods don't support Firewire for data exchange.

There's really no reason for Apple to drop Firewire, and it will be difficult for PC makers to match the features of Macs even when including Firewire ports on their PCs. Not only do BIOS PCs lack any firmware support for target mode use, but Microsoft dropped IP over Firewire in Vista (!). USB 3.0 might bump the speed for new devices, but it doesn't match the Firewire-related features that exist now, and doesn't match the throughput of FW3200, which is also in the pipeline.

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Re:A serious question

[LWATCDR]

Well part of it is Firewire isn't a replacement for USB. I haven't seen a Firewire keyboard, mouse, printer, or joystick. Yes it is mediocre all the way around but it works well for some devices that Firewire doesn't work at all for. And works well just okay for many devices that Firewire works well for. Firewire will always be an port you have to get in addition to USB. so it will alway be less popular. But I would agree with you that it isn't dead.

Still half vertically symmetric

[Trogre]

Aargh, this connector is *still* symmetrical vertically in form factor but not electrically. Which means you'll have people fumbling behind computers/laptops turning the connectors upside-down until the cable is twisted trying to plug in their camera/mouse/hdd/coffee maker.

Either change the shape of the connector (something like RJ11 would be fine) or make the pins such that it can be inserted right-way up or upside down (figure-eight power cable connectors for example).

And it doesn't work

[SuperKendall]

I bought a USB OTG external hard drive that is supposed to be able to copy files off a slave device, and a box that is supposed to support two master devices and initiate copies between them - neither work at all with any USB storage I have tried.

USB OTG is a farce.

Re:Probably not

[phallstrom]

Ludicrous speed!

There's really no other option...

Re:Probably not

[sconeu]

But then they'd have to make all the connectors plaid.

Re:One suggestion

[ffflala]

That's not true! USB 2.0 requires gold-plated contacts for maximum bus fidelity. Monster makes a good USB 2.0 cable, and it goes for a steal at $79.99 per cable.

If you put the 2.0 cables in the freezer to align the molecules before you use them you get even better bus response. All of my devices have this warmer, more human feel when I'm using properly-designed cables.