IOMEGA Caddy - new 3TB HDDs but only sees 800gb?

jc808

hi

i have an iomega mdhd15t-u2 1.5tb external caddy

i took out the old 750gb hdds out of it and put in new 1.5 tb ones - so its now 3tb

both an xp pc and mac i put it in only sees it as 800gb
what gives? havent formatted it yet

jc808

update

if you just have one hdd in there it shows '1.5tb' (ie the total capacity of the one hdd in there) as soon as you connect the second disk it reverts to '800gb' - ???

John_Gray

Though I have no idea why, it may be that your particular caddy doesn't support disks above a certain size. There is mention in the specs of many such caddies, but no explanation given.

jc808

Hmm, thats annoying, if it is the reason.
Thanks

Any other solutions?

Anthonis

try to read link below and then you will understand whats happening.
http://www.pcworld.com/article/235088/everything_you_need_to_know_about_3tb_hard_drives.html
You can use Pragon GPT Disc Management software to solve problem also...

jc808

very interesting - mine is 2x 1.5 tb drives but the enclosure effectively 'makes it' a 3tb one - i wonder if this is the problem...? thanks v v much anthonis

John_Gray

If the "iomega mdhd15t-u2 1.5tb external caddy" is implementing RAID-0 to effectively stick one disk after the other, then Anthonis' suggestion is probably correct.

3TB - 800 GB ~= 2.2 TB, the maximum addressable space without bodges in XP...