Advertisements I thought I'd start a list of drives that get stuck at the "Starting up" screen under Bolt TE4 21.x software release. This issue is now known to also apply to Edge (confirmed with WD40NPZZ & 7.68TB Micron SSD failing on Edge). Micron 5210 Ion 7.68TB SSD, but other sizes probably fail Micron 1100 2TB SSD, but other sizes probably fail WD40NPZZ, the only 2.5" 4TB WD rust drive WD20SPZX another 2.5" 2TB WD rust drive. WD208PZX - reported in another thread. Probably same as as WD20SPZX Possibly 3TB Toshiba MQ03ABB300 Seagate 2TB BarraCuda STL2000LM015 Seagate 1TB BarraCuda 2.5" ST1000LM048 Crucial SSD (no model number mentioned) WD60EMAZ Samsung MZ-76E2T0B/AM - 2TB 860 EVO SSD Samsung QVO SSD 8TB All SSD fail (no known SSD works) These drives work under TE3 20.x software, but as soon as you upgrade to TE4 the Tivo will no longer boot. You will see the screen stuck on the "Starting up" screen. It is possible to revert the TiVo back to TE3 with another drive and reuse the "failing" drive under TE3, but you will likely lose all recordings in the process if you wish to go back to the prior drive. Sometime late 2018, over several software upgrades, some drives began to exhibit this boot up issue. I first saw this issue with my Micron 1100 drive, then within 2 months all the WD40NPZZ drives refused to boot. Others saw the same issue with the WD20SPZX, which I also confirmed. Please add to this list if you find other drives that get stuck at the "Starting up" screen under TE4. If possible, please confirm the drive works under TE3. Drives still known to work without issues under TE3 or TE4: Toshiba MQ03ABB200 2TB 2.5" Seagate Barracuda ST5000LM000 5 TB 2.5" (SMR) Seagate FireCuda 2TB ST2000LX001 Seagate Firecuda ST1000LX015 Many 3.5" drives work, but you must use an external closure to supply the 12V rail needed by 3.5" drives. 2.5" 2TB & 3TB CMR Drives (thanks tommage1) [Update] The startup drive drive issue occurs with TE4. So the issue is found on both Bolt and Edge. I'm not sure if this would be found on older devices, but I don't expect anyone would try to run any of these 2.5" drives on the older Tivo models.