Nothing in particular really stands out as striking in terms of the 645H's design, which isn't to say it's an unattractive DVD recorder, just that Pioneer has focused more on its functionality than appearance. Weighing in at around 4.4kg and measuring 420mm by 318mm by 69mm, the 645H has been given a standard silver finish with a black horizontal stripe across the front. Underneath the stripe is a flip-down panel which gives access to two USB ports -- Type A and Type B -- as well as DV, S-Video, composite and stereo analog inputs. Pioneer strangely hides the playback controls behind this panel, too, but as the remote control gets used the majority of the time, we can understand their rationale to keep it out of sight.
At the back of the unit are the rest of the connections, which include HDMI, component and two sets of composite/S-Video and stereo analog outputs. There are also a further two inputs at the back for recording from sources such as Foxtel. Unfortunately though, the 645H has no control over external devices so you're stuck having to tediously program separate timers. A coaxial digital output is also here, but no optical audio.
Bright blue and red LEDs on the front signify whether you are in hard disk drive (HDD) or DVD mode, and will play back or record to the selected device. The 56-button remote is silver on the front and black on the back with large finger grooves.
A range of multimedia formats can be played back on the 645H, including JPEG photos, MP3 and WMA music files, VCD and DiVX movies. Most flavours of DVD are supported (DVD+R/RW, DVD-R/RW, DVD-RAM and DVD+R DL) as well as burnt CDs (CD-R/RW). As with most DVD recorders you can specify the quality of recordings. The 645H has six video compression settings which allow you to store anything between 53 hours and 532 hours worth of viewing on the HDD, but when you move up, expect some artefacts in your images. Similarly, these six presets can be applied to DVD recordings, giving you from one hour and 51 minutes at its finest setting, and up to 18 hours using super extended play on a dual-layer disc.
Chaseplay allows you to watch a recording that is still in progress -- being able to "chase" the live broadcast by fast forwarding through the ads as you go is a convenient feature when you come home in the middle of a show that's recording.
One-touch copy is a handy feature that will, at the push of a button on the remote, transfer the entire title you're watching from the hard disk onto DVD, or vice versa. Naturally, copy-protected DVDs will not work.
The jukebox feature of the 645H lets you copy songs from CDs in real-time to the hard disk and create a playlist of your favourite tracks. MP3s and WMAs can also be copied (at much higher speeds) from disk or USB sources to the hard drive. Using the USB connections, you can plug in your digital camera or card reader, save pictures directly to the HDD, or view them in a slideshow. If you have a PictBridge-compatible printer, the 645H also lets you print without having to use a computer.
Pioneer supplies two AA batteries for the remote, an AV cable, an RF antenna cable, a power cable and a 135-page user manual in the box with the 645H.