metadata format 00.90 unknown, ignored

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i'm not sure exactly what i did wrong and i wouldn't mind starting
over only i'm not sure how.

i created a raid level 1 array using 2 disks.

mdadm --create /dev/md0 --level=1 --raid-devices=2   /dev/sda   /dev/sdc

then i realized i was supposed to partition these hard drives before
creating the array.

so i stopped the array after creation was complete,

mdadm --stop /dev/md0

and partitioned the hard drives for linux raid auto 'fd'. i only put
one partition on each hard drive.

then i tried to assemble the array like this:

mdadm --assemble /dev/md0 /dev/sda1 /dev/sdc1

but i get these errors:

mdadm: metadata format 00.90 unknown, ignored.
mdadm: cannot open device /dev/sda1: No such file or directory
mdadm: /dev/sda1 has no superblock - assembly aborted

i'm not sure what to do from here... can someone help??
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