This lot of eight Dell 2.5" SAS server HDDs have a rotation speed of 10,000 RPM and a storage capacity of 600 GB. They are compatible with a variety of Dell server models, including the R610, R620, R630, R710, R720, and R730, as well as HP DL360, DL380, and DL385 G5, G6, and G7 servers. The hot-swappable drives support SAS interface and have a cache of 64 MB. SHIPS WITHIN 1-2 BUSINESS DAYS Model: AL13SEB600 (Total of 8 drives) Interface: 2.5" SAS This is bare drive only with no caddy. Form Factor: 2.5" (These are 2.5" and not 3.