So, JR#97,...
you're saying the FD-8 will record 2-tracks simul with the analog mixer, and 4-tracks simul with the analog mixer + s/p-dif as an additional 2 inputs? (I'll check the manual).
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> The FD-4 & FD-8 will record to either an optionally installed internal hard disc, or an external scsi disc.
[My FD-8 has an internal disc, with over 50 hours of linear record time].
[My FD-4 has an external Syquest 230MB disc cartridge drive, and due to drive noise, I also have the drive placed in a stack of foam padding that fits snugly around it,... the old foam padding from former hard drive boxes].
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The new Tascam DP-01 looks cool, but the FD8 mixer section still beats it.
The Tascam DP-01 makes huge improvements to the likes of the MR-8 style units, (like a built-in hard disc & external mixer controls), but it's still not as high end or feature loaded as the FD-8 or many other genuine Portastudios [488mkII, 688], or the Tascam 388. The Yamaha MD-8 is still a much better porta-format 8-tracker, than the likes of the MR-8, based on features.
The MR-8 and a lot of other similar digital flash usb porta's are computer oriented machines. (Record) save-&-Dump machines. Save/dump, save/dump. Over & over. Save/dump. If you are not inclined to using the computer for basic function of your multi tracking, (record-save-dump), then none of these units are good for you. (If you prefer 'puter recording, then go for it).
The FD-8 is still a topline unit, as compared to many of the newest multitrackers.