Disclosed herein are techniques for managing partitions on a storage device. A method can include (1) identifying a storage capacity of the storage device, (2) generating a first data structure that defines a first partition on the storage device, where the first partition consumes a first amount of the storage capacity, and (3) generating a second data structure that defines a second partition on the storage device, where the second partition consumes at least a portion of a remaining amount of the storage capacity relative to the first amount. In response to receiving a shrink request directed to the first partition, the method can further include (4) identifying a first utilized area within the first partition that will no longer be utilized as a result of the shrink request, and (5) updating first information in the first data structure to indicate that the first utilized area is unutilized.