@moiety @carbontwelve @ben the storage system is described in paper II, open access. https://iopscience.iop.org/article/10.3847/2041-8213/ab0c96 page 8. on each telescope there are 4 signal chains. each chain is recording at 16Gbps over dual 10gigE writing to 32 HDDs in parallel. So 128 HDDs per telescope in all. 6-10 TB helium filled disks. Total data size of 1-2 PB per telescope, so I guess that's just one telescope's data on the desk.
The data is formatted as VDIF packets, so while it may be split into different files on the disks it can be reconstructed into the full stream.