To many, the requirement of SonicStage for audio transfers has been a constant drawback. In 2005, Sony announced Hi-MD Photo. The Sony MZ-DH10P Walkman was released to showcase the format. The unit offers a 1.3 megapixel digital camera and saves pictures to Hi-MD discs, but does not offer a microphone input to record live audio, as do most standard Hi-MD Walkmans. The unit was praised for its full-colour display and unique photo & music features, but met with limited market success. In March 2006, Sony released the MZ-RH1 Hi-MD Walkman in Japan, which was later followed in other regions. With this unit, Sony enabled faster-than-realtime full digital transfers from standard MiniDiscs to the computer for the first time. Users with extensive MiniDisc collections, for example, could upload their recordings digitally faster than real-time via USB connection, just like Hi-MD recordings already offered. One limitation is with transfers done from MiniDiscs recorded on NetMD devices. Recordings transferred from PC using OpenMG or SonicStage software are by design not transferable. (This limitation does not apply to recordings made with SimpleBurner software.) There is a rather difficult workaround to this restriction that involves "TOC Cloning", whereby the TOC from a disc containing these restricted tracks is replaced by the TOC from a disc created using mic-in or line-in. Due to the technical difficulty of this technique (only a small number of units are capable of TOC Cloning, and some require mechanical manipulation), the practicality of TOC Cloning as a workaround is inherently low. These digital transfers of standard (pre-Hi-MD) MiniDiscs are in addition to the essentially unrestricted Hi-MD transfers already available since the online availability of SonicStage 3.4 (and later). With the MZ-RH1, Sony made tangible speed improvements to the device over previous generations of Hi-MD recorders. The result being that the transfer times to and from computer are—under certain circumstances—cut in half over previous models, but still noticeably slower than flash memory and hard drive-based portables, because of the nature of the Hi-MD magneto-optical system. Criticisms of the Hi-MD format (nearly all apply to standard MiniDisc and NetMD, too):       In 2006, Sony positioned Hi-MD as a Digital Audio Tape (DAT) alternative, placing the MZ-M200 Hi-MD Walkman under the Pro Audio section of its "Broadcast & Business Solutions Company" website, alongside its flash memory-based recorder, the PCM-D1.