Well, perhaps it's been changed since I had a DS1000Z and DS2000 sitting on my desk simultaneously, but the last time I checked there was no WAVEFORM:STATUS command on the DS1000Z (as there is on the DS2000/4000).
you are right!. but the "theoritical" above means based on the assumption that the current DS2000 hardware or api model is not necessitating "WAVEFORM:STATUS" anymore, i mean less capable DS1000Z doesnt have to confirm its wav/data transfer status, you can read a fixed size of chunks continuously, asking the next chunk will either send the next chunk immediately or hold the caller until the next chunk is ready for the transfer. i'd be surprised if DS2000 is too slow at transferring say 1000 bytes sized of chunks continuously.
thats why saving to wfm in dso unit, is much more sensible action, still it takes longer if not forever to save wfm internally.
Which is another reason why it it's so damn stupid that Rigol changed the WFM format in the Ultravision DSOs from the previous format in the "E" (and older) DSOs. And they still have not (as far as I know) published specs for the format - although I know that Drieg was trying to get the specs from them quite some time ago.
lets put wfm format aside alone, even the simple text based csv format, the rigol sw developers cant get it right after so many years. i bought my DS1000Z with original FW and with different CSV format, and now upgraded to the latest FW only few months apart, has different CSV format
i'm imagining rigol sw engineer is a 25 years old lad by now (18 when first assigned) who is so busy with other tasks that he cant get a proper course on file format standard. it always freaked me out when i think that the same lad is assigned to formalize the wfm formats across dso/fw generations. another possibility is that for each dso/fw generations, there will be a sw.eng. undergraduate assigned for the task during his/her practical training, which is equally freaking situation. file format standard in rigol is next to a total failure.
ps: i've made visadso to read the latest ds1000z wfm format. but its a retarded hack.