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# FocusDrive3
The FocusDrive3 device driver supports the Focus IDE interface card in the Apple /// as part of the SOS operating system. SOS is very much like ProDOS in terms of filesystem layout; however, most Apple /// interpreters use a signed integer to represent blocks, so the standard maximum size of partition for ProDOS (65535 blocks, ~64MB) is halved in SOS as 32767 blocks (~32MB).
The FocusDrive3 device driver supports the Focus IDE interface card in the Apple /// as part of the SOS operating system. SOS is very much like ProDOS in terms of filesystem layout; however, most Apple /// interpreters use a signed integer to represent blocks, so the standard maximum size of partition for ProDOS (65535 blocks, ~32MB) is halved in SOS as 32767 blocks (~16MB).
## Drive Preparation
There's no ///-based partitioning software avaialble, so you will want to have a pre-partitioned CF card or IDE drive with partitions of size 32767 blocks (~32MB) or less for best results. As of this writing, the partitioning software only runs on the IIgs.