BrightSign Object Reference Manual (FW 5.1) - Manual (Page 169)

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sd_mfr_id Int Card manufacturer ID as assigned by the SD Card Association
sd_oem_id String Two-character card OEM identifier as assigned by the SD Card Association
sd_product_name String Product name, assigned by the card manufacturer (5 bytes for SD, 6 bytes for MMC)
sd_spec_vers
Int Version of SD spec to which the card conforms
sd_product_rev String Product revision assigned by the card manufacturer
sd_speed_class String Speed class (if any) declared by the card
sd_au_size
Int Size of the SD AU in bytes.
Example:
si=CreateObject("roStorageInfo", "SD:/")
Print si.GetFreeInMegabytes(); "MiB free"