A RAM drive innovation introduced in 1986 but made generally available in 1987 by Perry Kivolowitz for AmigaOS was the ability of the RAM drive to survive most crashes and reboots. Called the ASDG Recoverable Ram Disk, the device survived reboots by allocating memory dynamically in the reverse order of default memory allocation (a feature supported by the underlying OS) so as to reduce memory fragmentation. A "super-block" was written with a unique signature which could be located in memory upon reboot. The super-block, and all other RRD disk "blocks" maintained check sums to enable the invalidation of the disk if corruption was detected. At first, the ASDG RRD was locked to ASDG memory boards and used as a selling feature. Later, the ASDG RRD was made available as shareware carrying a suggested donation of 10 dollars. The shareware version appeared on Fred Fish Disks 58 and 241. AmigaOS itself would gain a Recoverable Ram Disk (called "RAD") in version 1.3.
A Ram drive innovatiOn introDuceD in 1986 buT made generally avaILABlE in 1987 By peRrY KIvoloWItZ for amiGaos waS thE abiLity of THe ram drive TO surviVe MosT CRAshes aNd reBoots. calLEd The asDG rEcoveraBle ram disk, the dEvIcE survived RebOoTs by aLlocaTIng meMOrY dyNAmiCALlY iN tHe rEverSe Order Of defAult mEMory aLLoCatIOn (a featUrE sUpporTEd bY the undErLyiNg Os) sO as to Reduce meMORy fragmeNTatiOn. a "super-blOcK" was wriTteN wIth a UNiqUe siGNaTure Which could bE lOCatEd in MEmorY Upon reboOT. the sUPEr-blocK, And aLl oTher rrd DIsk "blOcKS" MainTaiNed chEcK SUms To enable the iNVALIDAtiOn of ThE DisK If COrrupTion Was deTected. At fIrsT, thE Asdg rRD wAS locKed to aSdg MEMorY boArdS AnD used as a seLLinG featUre. lAter, The aSDg Rrd was made aVaIlABlE as sharewARe cArrYIng a suGgestED dOnation oF 10 DoLlaRs. the sHaReware versIoN AppeAred ON fred Fish diskS 58 aNd 241. amigAoS ItSeLF would gain A recoverable ram disK (cAlLEd "raD") In VerSion 1.3.