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A30 Pentium 3 512MB ram 60GB HDD Win 98SE
HP 8460p 2nd gen i7 8GB ram 500GB HDD Radeon 6470m Win 7
T440p 4th gen i7 12GB ram GT 730m 1TB SSD Win 10
X1 Extreme Gen 2 16GB ram 1650 M-Q 1TB SSD Win 10
x260 6th gen i-series
Mum's T440s 4th gen i5 8GB ram 300GB SSD Win 10
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU
The M.2 slot can take a max 512 GB drive and unfortunately no top-tier brands make drives in that form factor. Best available is probably Transcend; slower than big names but probably not enough to notice.
As dr_st said, a 1 TB 2.5" SSD will probably be cheaper than two smaller ones would be. 256 GB and smaller drives especially are far more per GB than anything larger in the same product line [EDIT: also lower-capacity drives tend to have lower performance].
Probably only good reason to want two physical drives is for redundancy; I like to have an extra drive I can boot from if primary fails or is corrupted.
EDIT: Transcend now has an MTS430S 512 GB drive available for M.2 SATA 42mm. This is a TLC drive and much less expensive than the MLC MTS400 now.
X31, X40, X61T, X61, X201, X220 (i7 IPS), W520 (FHD), T440p (FHD),
Dells: Latitude C840, Precision M70, Precision M4400, M6400 (WUXGA), M6600, M6700, 7730, XPS 13
Daily driver: MS Surface Pro 7 (i7)
Recently I tried to install an WesternDigital SN520 2242 M.2 Nvme SSD on it, since it only allows 2242 M.2 B-key type (https://www.westerndigital.com/products ... -sn520-ssd), but it was not recognized since it results in boot error "2102: Detection error on ssd1 (M.2)".
In "2.5" SATA/SATA express" hdd slot this same SSD Nvme drive can be used together with the Lenovo's option part for T470p named "SSD ADAPTER BRACKET SM12Y000400 M.2 2280" FRU 01HY319, working with full 16Gb/s data transfer bandwidth.
Western Digital SN520 NVMe (@T470p SATAexpress bracket) 512GB
ThinkPad T23 (2647-BG9)
Hitachi TravelStar K7K100 80GB
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