The IBM microdrive is the original “microdrive.” It is now manufactured by Hitachi. It currently has a storage capacity of 170MB, 340MB, 512MB, 1GB, and 4GB.
The Hitachi microdrive is available in the following storage capacities: 512MB, 1GB, 2GB, 3GB, 4GB, 6GB, 8GB, and 10GB.
GS Magic microdrive
The GS Magic microdrive is available in the following storage capacities: 2.2GB ATA, USB (native), and CF variants, 3GB ATA, and 4GB ATA and CF variants.
Seagate ST1 microdrive
The Seagate STI microdrive is available in 2.5GB, 4GB, 5GB, 6GB, 8GB, and 12GB. It has a cache memory of 2MB.
Sony Compact Vault
The Sony Compact Vault is available in 2GB (rebadged Hitachi), 4GB (rebadged Hitachi), 5GB, and 8GB.
The Cornice microdrive has a storage capacity of 4GB.